Hydrogen

Which is used hydrogen generators? [CPMT 1999]
1. NaH
2. HI
3. S₆H₃
4. None of these
Hydrogen burns in air with [RPET 2003]
1. Light bluish flame
2. Yellow flame
3. Green flame
4. None of these
Which pair does not show hydrogen isotopes? [UPSEAT 2003]
1. Ortho hydrogen and para hydrogen
2. Protium and deuterium
3. Deuterium and tritium
4. Tritium and protium
Which of the following will be distilled first? [Pb. PMT 2002]
1. Liquid CO₂
2. Liquid N₂
3. Liquid O₂
4. Liquid H₂
On reaction with Mg, very dilute nitric acid produces [CPMT 2003]
1. NH₃
2. Nitrous oxide
3. Nitric oxide
4. Hydrogen
Among the following, identify the compound which cannot act as both oxidising and reducing agents? [AMU 2002]
1. H₂O₂
2. H₂
3. SO₂
4. Cl₂
Which of the following reaction produces hydrogen? [AIIMS 2002]
1. Mg+H₂O
2. BaO₂+HCl
3. H₂S₄O₈+H₂O
4. Na₂O₂+2HCl
Which of the following properties resembles hydrogen? [MH CET 2001]
1. Halogen
2. Alkali metals
3. Halogen and Alkali metals
4. None of these
Ortho and para hydrogen differ in [AFMC 2001]
1. Proton spin
2. Electron spin
3. Nuclear charge
4. Nuclear reaction
Action of water or dilute mineral acids on metals can give [Kerala (Med.) 2002]
1. Monohydrogen
2. Tritium
3. Dihydrogen
4. Trihydrogen
Hydrogen from HCl can be prepared by [Pb. CET 1997]
1. Mg
2. Cu
3. P
4. Pt
Which of the following can adsorb largest volume of hydrogen gas?
1. Finely divided platinum
2. Finely divided nickel
3. Colloidal palladium
4. Colloidal platinum
How many neutrons does the nuclei of tritium atom contain?
1. 1
2. 2
3. 3
4. 4
What is the colour of hydrogen?
1. Black
2. Yellow
3. Orange
4. Colourless
Which is a mixture of Ordinary hydrogen at room temperature?
1. 75% of o-Hydrogen + 25% of p-Hydrogen
2. 25% of o-Hydrogen + 75% of p-Hydrogen
3. 50% of o-Hydrogen + 50% of p-Hydrogen
4. 1% of o-Hydrogen + 99% of p-Hydrogen
Which of the following will not be reduced by hydrogen?
1. Hot CuO
2. Fe₂O₃
3. Hot SnO₂
4. Hot Al₂O₃
Hydrogen does not combine with
1. Antimony
2. Sodium
3. Bismuth
4. Helium
What is known as adsorption of hydrogen by metals? [EAMCET 1999; Manipal PMT 1999]
1. Dehydrogenation
2. Hydrogenation
3. Occlusion
4. Adsorption
Which of the following produces hydrolith with dihydrogen?
1. Mg
2. Al
3. Cu
4. Ca
Which metal displaces hydrogen from a boiling caustic soda solution?
1. As
2. Zn
3. Mg
4. Fe
Metals like platinum and palladium can absorb large volumes of hydrogen under special conditions. Such adsorbed hydrogen by the metal is known as
1. Adsorbed hydrogen
2. Occluded hydrogen
3. Reactive hydrogen
4. Atomic hydrogen
Which is poorest reducing agent?
1. Nascent hydrogen
2. Atomic hydrogen
3. Dihydrogen
4. All have same reducing strength
What is the sum of protons, electrons and neutrons in the heaviest isotope of hydrogen?
1. 6
2. 5
3. 4
4. 3
How many number of nucleons in D₂ molecule?
1. 1
2. 2
3. 3
4. 4
An ionic compound is dissolved simultaneously in heavy water and simple water. What is its solubility?
1. Larger in heavy water
2. Larger in heavy water
3. Solubility is same in both
4. Smaller in simple water
What is the difference between heat of adsorption in ortho and para hydrogen?
1. 0.4kJ mol^-1
2. 0.8kJ mol^-1
3. Zero
4. None of these
Which of the following is isoelectronic with hydrogen ion H⁻?
1. Li
2. He
3. H⁺
4. Li⁻
At which of the following condition hydrogens can be fused to form helium? [AFMC 2005]
1. High temperature and high pressure
2. High temperature and low pressure
3. Low temperature and high pressure
4. Low temperature and low pressure
Hydrogen can be prepared by mixing steam, and water gas at 500°C in the presence of Fe3O4 and Cr2O3 this process is known as
1. Nelson process
2. Serpeck's process
3. Bosch process
4. Parke's process
Which of the following metal do not liberate hydrogen from dilute hydrochloric acid?
1. Zn
2. Mg
3. Fe
4. Au
An element reacts with hydrogen to form a compound A which on treatment with water liberates hydrogen gas. What will be the element?
1. Nitrogen
2. Chlorine
3. Selenium
4. Calcium
What happens to hydrogen when it combines with other elements?
1. Losing an electron
2. Gaining an electron
3. Sharing an electron
4. Losing, gaining or sharing electron
Which of the following explanation is best for not placing hydrogen with alkali metals or halogen?
1. The ionization energy of hydrogen is high for group of alkali metals or halogen
2. Hydrogen can form compounds
3. Hydrogen is a much lighter element than the alkali metals or halogens
4. Hydrogen atom does not contain any neutron
Which of the following terms is not correct for hydrogen?
1. Its molecule is diatomic
2. It exists both as H⁺ and H⁻ in different chemical compounds
3. It is the only species which has no neutrons in the nucleus
4. Heavy water is unstable because hydrogen is substituted by its isotope deuterium
What will happen if electric current is passed through an ionic hydride in the molten state?
1. Hydrogen is liberated at the anode
2. Hydrogen is liberated at the cathode
3. No reaction takes place
4. Hydride ion migrates towards cathode
Which of the following statements is most applicable to hydrogen?
1. It can act as a reducing agent
2. It can act as an oxidising agent
3. It can act both as oxidising and reducing agent
4. It can neither act as oxidising nor as a reducing agent
Which of the following properties hydrogen has?
1. Electropositive
2. Electronegative
3. Both electropositive as well as electronegative
4. Neither electropositive nor electronegative
Hydrogen acts as a reducing agent. What this resembles?
1. Halogen
2. Noble gas
3. Radioactive elements
4. Alkali metals
Which position for hydrogen explain all its properties?
1. At the top of halogen
2. At the top of alkali metals
3. At the top of carbon family
4. None of these
Hydrogen readily combines with non-metals. What does it shows?
1. Electronegativity character
2. Electropositive character
3. Both a and b
4. None of these
Protonic acid is
1. A compound that form solvated hydrogen ion in polar solvent
2. An acid which accepts the proton
3. A compound that forms hydride ion in polar solvent
4. An acid which donates the proton
Which of the following statements concerning protium, deuterium and tritium is not true?
1. They are isotopes of each other
2. They have similar electronic configurations
3. They exist in the nature in the ratio of 1 : 2 : 3
4. Their mass numbers are in the ratio of 1 : 2 : 3
When SO₃ is treated with heavy water the product is/are
1. Deuterium and sulphuric acid
2. Deuterium and sulphurous acid
3. Only deuterium
4. Dideuterosulphuric acid
Hydrogen has three isotopes, the number of possible diatomic molecules will be
1. 2
2. 6
3. 9
4. 12
Pure hydrogen is obtained by carrying electrolysis of
1. Water containing H₂SO₄
2. Water containing NaOH
3. Ba(OH)₂ solution
4. KOH solution
In Bosch's process, which gas is utilised for the production of hydrogen gas?
1. Producer gas
2. Water gas
3. Coal gas
4. None of these
Deuterium differs from hydrogen in
1. Chemical properties
2. Physical properties
3. Both physical and chemical properties
4. Radioactive properties
Tritium undergoes radioactive decay giving
1. Alpha particles
2. Beta particles
3. Neutrons
4. Gamma rays
The gas used in the hydrogenation of vegetable oils in the presence of nickel as catalyst is
1. Methane
2. Ethane
3. Ozone
4. Hydrogen
The conversion of atomic hydrogen into ordinary hydrogen is
1. Exothermic change
2. Endothermic change
3. Nuclear change
4. Photochemical change
The name hydrogen was given by
1. Cavendish
2. Lavoisier
3. Urey
4. None of these
Triatomic hydrogen is called
1. Deuterium
2. Hyzone
3. Ortho form
4. Hydronium ion
Ionic hydrides are usually
1. Good electrically conductors when solid
2. Easily reduced
3. Good reducing agents
4. Liquid at room temperature
Systematic name of H₂O(oxide of hydrogen) is
1. Water
2. Hydrogen oxide
3. Oxidane
4. None of these
Hydrogen directly combines with [Roorkee Entrance 1990]
1. Au
2. Cu
3. Ni
4. Ca
Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO₂ is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A [Pb. CET 1990; AIIMS 1999]
1. CaCO₃
2. CaO
3. Ca(OH)₂
4. Ca(HCO₃)₂
When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution the ratio of volumes of hydrogen evolved is [CPMT 1991]
1. 1 : 1
2. 1 : 2
3. 2 : 1
4. 9 : 4
Which is the lightest gas? [CPMT 1993]
1. Nitrogen
2. Helium
3. Oxygen
4. Hydrogen
The composition of tritium is [UGET Manipal 1995]
1. 1 electron, 1 proton, 1 neutron
2. 1 electron, 2 protons, 1 neutron
3. 1 electron, 1 proton, 2 neutrons
4. 1 electron, 1 proton, 3 neutrons
The property of hydrogen which distinguishes it from alkali metals is
1. Its electropositive character
2. Its affinity for non-metal
3. Its reducing character
4. Its non-metallic character
The hydride ion H⁻ is a stronger base than its hydroxide ion OH−. Which of the following reactions will occur if sodium hydride (NaH) is dissolved in water [CBSE PMT 1997]
1. H⁻(aq)+H₂O→H₃O⁻(aq)
2. H⁻(aq)+H₂O(l)→OH⁻(aq)+H₂(g)
3. H⁻(aq)+H₂O(l)→No reaction
4. None of these
Hydrogen accepts an electron to form inert gas configuration. In this it resembles [Pb. PMT 1997]
1. Halogen
2. Alkali metals
3. Chalcogens
4. Alkaline earth metals
Which of the following is correct for hydrogen? [AFMC 1997; BHU 1997]
1. It can form bonds in +1 as well as -1 oxidation state
2. It is always collected at cathode
3. It has a very high ionization potential
4. It has same electronegativity as halogens
Which of the following will not displace hydrogen [Pb. PMT 1999]
1. Ba
2. Pb
3. Hg
4. Sn
Which of the following gas is insoluble in water [Pb. CET 2003]
1. SO₂
2. NH₃
3. H₂
4. CO₂
Which element forms maximum number of compounds in chemistry? [Pb. CET 2004]
1. O
2. H
3. Si
4. C
Hydrogen is not obtained when zinc reacts with [J & K 2005]
1. Cold water
2. Hot NaOH solution
3. Conc. sulphuric acid
4. dilute HCl
Metal hydride on treatment with water gives [Bihar CEE 1995]
1. H₂O₂
2. H₂O
3. Acid
4. Hydrogen
Which pair does not show hydrogen isotopes [UPSEAT 2003]
1. Ortho hydrogen and para hydrogen
2. Protium and deuterium
3. Deuterium and tritium
4. Tritium and protium
Ionization energy of hydrogen is
1. Equal to that of chlorine
2. Lesser than that of chlorine
3. Slightly higher than that of chlorine
4. Much higher than that of chlorine
Hydrogen is not obtained when zinc reacts with
1. Cold water
2. Hot sodium hydroxide
3. Conc. Sulphuric acid
4. Dilute hydrogen chloride
Water cannot act as
1. Oxidant
2. Hydrolytic agent
3. Hydrogenating agent
4. Reductant
Ortho hydrogen and para hydrogen resembles in which of the following property
1. Thermal conductivity
2. Magnetic properties
3. Chemical properties
4. Heat capacity
Hydrogen accepts an electron to form inert gas configuration. In this it resembles
1. Halogen
2. Alkali metals
3. Chalcogens
4. Alkaline earth metals
Hydrogen is
1. Electropositive
2. Electronegative
3. Both electropositive and electronegative
4. Neither electropositive nor electronegative
The property of hydrogen which distinguishes it from alkali metals is
1. Its electropositive character
2. its affinity for non-metal
3. Its reducing character
4. Its non-metallic character
Hydrogen has three isotopes, the number of possible diatomic molecules will be
1. 3
2. 6
3. 9
4. 12
The sum of protons,electrons and neutrons in the heaviest isotope of hydrogen is
1. 6
2. 5
3. 4
4. 3
Hydrogen does not combine with
1. Helium
2. Bismuth
3. Antimony
4. Sodium
The sum of proton,electrons and neutrons in the lightest element of hydrogen is
1. 3
2. 5
3. 2
4. 6
In all its properties, hydrogen resembles:
1. Alkali metals only
2. Halogens only
3. Both alkali metals and halogens
4. Neither alkali metals nor halogens
Which one is not an isotope of hydrogen?
1. Tritium
2. Deuterium
3. Ortho hydrogen
4. None of these
The composition of tritium is
1. 1 electron, 1 proton, 1 neutron
2. 1 electron, 2 protons, 1 neutron
3. 1 electron, 1 proton, 2 neutrons
4. 1 electron, 1 proton, 3 neutrons
Deuterium differs from hydrogen in
1. Chemical properties
2. Physical properties
3. Both physical and chemical properties
4. Radioactive properties
The oxidation states exhibited by hydrogen in its various compounds are
1. -1 only
2. Zero only
3. +1, -1 and zero
4. +1 only
Ortho and para hydrogen differ in
1. Proton spin
2. Electron spin
3. Nuclear charge
4. Nuclear Reaction
Action of water or dilute mineral acids on metal can give
1. Monohydrogen
2. Tritium
3. Dihydrogen
4. Trihydrogen
Triple point of water is
1. 273 K
2. 373 K
3. 203 K
4. 193 K
Which of the folloing is used as a moderator in nuclear reactors?
1. Ordinary water
2. Heavy water
3. Hard water
4. Hydrogen peroxide
Alkali metal hydrides react with water to give
1. Acidic solution
2. Basic solution
3. Neutral solution
4. Hydride ion
Which one of the following removes temporary hardness of water?
1. Slaked lime
2. Plaster of paris
3. Cuprous
4. Hydrolith
Polyphosphates are used as water softening agents because
1. form soluble complexes anionic species
2. Precipitate anionic species
3. form soluble complexes with cationic species
4. Precipitate cationic species
The reagent commonly used to determine hardness of water titrimetrically is
1. Oxalic acid
2. Disodium salt of EDTA
3. Sodium citrate
4. Sodium thiosulphate
Select the correct statement for heavy water
1. It is less denser than common water
2. It is an oxide of deuterium
3. It has a heavy or bad taste
4. It has a heavier isotope of oxygen.
Lead pipes are not used for carrying drinking water because
1. They are covered with a coating of lead carbonate
2. They are corroded by air and moisture
3. Water containing dissolved air attack lead forming soluble hydroxide
4. None of these
Heavy water is used in nuclear reactors as
1. Source of alpha particles
2. Slowing down the speed of high energy neutrons
3. Transporting heat of the reactor
4. Heating purpose
Heavy water is a compound of
1. Hydrogen and heavier isotope of oxygen
2. Heavier isotope of hydrogen and heavier isotope of oxygen
3. Oxygen and heavier isotope of hydrogen
4. None of these
Which of the following statements do not define the characteristic property of water " Water is a universal solvent"?
1. It can dissolve maximum number of compounds
2. It has very low dielectric constant
3. It has high liquid range
4. None of these
Molecular weight of heavy water is
1. 19
2. 18
3. 17
4. 20
Which of the following can effectively remove all types of hardness of water?
1. Soap
2. Washing soda
3. Slaked lime
4. None of these
When two ice cubes are pressed over each other they unite to form one cube.Which of the following forces is responsible to hold them together?
1. Hydrogen bond formation
2. Van der Waals forces
3. Covalent attraction
4. Ionic interaction
The $H - O - H$ angle in water molecule is about
1. $90 °$
2. $180 °$
3. $102 °$
4. $105 °$
Which of the following metal will not reduce $H_{2} O$ ?
1. $Ca$
2. $Fe$
3. $Cu$
4. $Li$
When zeolite (hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with
1. ${OH}^{-}$ ions
2. ${SO}_{4}^{2 -}$ ions
3. ${Ca}^{2 +}$ ions
4. $H^{+}$ ions
Of the two solvent $H_{2} O$ and $D_{2} O$ , $NaCl$ dissolves
1. Equally in both the solvents
2. Only in $H_{2} O$ but remains insoluble in $D_{2} O$
3. More in $D_{2} O$
4. More in $H_{2} O$
The bond angle and dipole moment of water respectively are
1. $109 °, 1.84 D$
2. $107.5 °, 1.56 D$
3. $104.5 °, 1.84 D$
4. $102.5 °, 1.56 D$
Equivalent weight of $H_{2} O_{2}$ is
1. 17
2. 34
3. 68
4. 18
The decomposition of $H_{2} O_{2}$ can be checked by the addition of
1. Alkali metal oxides
2. Benzene
3. Acetanilide
4. ${MnO}_{2}$
The amount of $H_{2} O_{2}$ present in 1l of 1.5 N $H_{2} O_{2}$ solution is
1. 2.5 g
2. 25.5 g
3. 3.0 g
4. 8.0 g
Which substance does not speed up decomposition of $H_{2} O_{2}$ ?
1. Glycerol
2. $Pt$
3. Gold
4. ${MnO}_{2}$
The $H - O - O$ bond angle in $H_{2} O_{2}$ is
1. $107.28 °$
2. $109.28 °$
3. $104.5 °$
4. $97 °$
The dihedral angle in gaseous $H_{2} O_{2}$ is
1. $180 °$
2. $90 °$
3. $111.5 °$
4. $109 ° 28'$
Nitrates of all metals are
1. Soluble in water
2. Insoluble
3. Coloured
4. Unstable
$H_{2} O_{2}$ used in rockets has the concentration
1. 50%
2. 70%
3. 30%
4. 90%
$H_{2} O_{2}$ is
1. Poor polar solvent than water
2. Better polar solvent than water
3. Both have equal polarity
4. Better polar solvent but its strong auto oxidising ability limits its use as such
The volume of oxygen liberated from 0.68 g of $H_{2} O_{2}$ is
1. 112 ml
2. 224 ml
3. 56 ml
4. 336 ml
$H_{2} O_{2}$ acts as an oxidising agent in
1. Neutral medium
2. Acidic medium
3. Alkaline medium
4. Acidic and Alkaline medium
On shaking $H_{2} O_{2}$ with acidified potassium dichromate and ether, etheral layer becomes
1. Green
2. Red
3. Blue
4. Black
$HCl$ is added to following oxides.Which one would give $H_{2} O_{2}$
1. ${MnO}_{2}$
2. ${PbO}_{2}$
3. $BaO$
4. None of these
An oxide which gives $H_{2} O_{2}$ on treatment with dilute acid is
1. ${PbO}_{2}$
2. ${Na}_{2} O_{2}$
3. ${MnO}_{2}$
4. ${TiO}_{2}$
$H_{2} O_{2}$ is used as
1. Antiseptic
2. Bleaching agent
3. Propellant
4. All
The structure of $H_{2} O_{2}$ is
1. Planar
2. Non-planar
3. Spherical
4. linear
There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength
1. 3.00%
2. 4.045%
3. 2.509%
4. 3.035%
$H_{2} O_{2}$ is always stored in black bottles because
1. It is highly unstable
2. Its enthalpy of decomposition is high
3. It undergo autooxidation on prolonged standing
4. None of these
A dilute solution of $H_{2} O_{2}$ is labelled as 20 volume.Its percentage strength is
1. 10%
2. 6.070%
3. 30%
4. 3%
The volume of oxygen liberated from 15 ml of 20 volume $H_{2} O_{2}$ is
1. 250 ml
2. 300 ml
3. 150 ml
4. 200 ml
$H_{2} O_{2} \to H_{2} O + O_{2}$
this represents
1. Oxidation of $H_{2} O_{2}$
2. Reduction of $H_{2} O_{2}$
3. Disproportionation of $H_{2} O_{2}$
4. Acidic nature of $H_{2} O_{2}$
$H_{2} O_{2}$ can be obtained when following reacts with $H_{2} {SO}_{4}$ except with
1. ${PbO}_{2}$
2. ${BaO}_{2}$
3. ${Na}_{2} O_{2}$
4. ${SrO}_{2}$
Commercial 11.2 volume $H_{2} O_{2}$ solution has a molarity of
1. 1
2. 0.5
3. 11.2
4. 1.12
Blackend oil painting can be restorted into original form by the action of
1. ${Cl}_{2}$
2. $H_{2} O_{2}$
3. ${MnO}_{2}$
4. ${PbO}_{2}$
Which of the following undergoes reduction with $H_{2} O_{2}$ in an alkaline medium?
1. ${Mn}^{2 +}$
2. $HOCl$
3. $PbS$
4. ${Fe}^{2 +}$
In alkaline medium $H_{2} O_{2}$ reacts with ${Fe}^{3 +}$ and ${Mn}^{2 +}$ respectively to give
1. ${Fe}^{4 +} and {Mn}^{4 +}$
2. ${Fe}^{2 +} and {Mn}^{2 +}$
3. ${Fe}^{2 +} and {Mn}^{4 +}$
4. ${Fe}^{4 +} and {Mn}^{2 +}$
$H_{2} O_{2}$ can be obtained when following reacts with $H_{2} {SO}_{4}$ except with
1. ${PbO}_{2}$
2. ${BaO}_{2}$
3. ${Na}_{2} O_{2}$
4. ${SrO}_{2}$
In lab $H_{2} O_{2}$ is prepared by
1. $cold H_{2} {SO}_{4} + {BaO}_{2}$
2. $HCl + {BaO}_{2}$
3. $conc H_{2} {SO}_{4} + {Na}_{2} O_{2}$
4. $H_{2} + O_{2}$
The oxide that gives hydrogen per oxide on the treatment with a dilute acid ( $H_{2} {SO}_{4}$ ) is
1. ${MnO}_{2}$
2. ${PbO}_{2}$
3. ${Na}_{2} O_{2}$
4. ${TiO}_{2}$
The reaction of $H_{2} S + H_{2} O_{2} \to S + 2 H_{2} O$ manifests
1. Acidic nature of $H_{2} O_{2}$
2. Alkaline nature of $H_{2} O_{2}$
3. Oxidising nature of $H_{2} O_{2}$
4. Reducing action of $H_{2} O_{2}$
Hydrogen peroxide is now generally prepared on industrial scale by the
1. action of $H_{2} {SO}_{4}$ on barium peroxide
2. action of $H_{2} {SO}_{4}$ on sodium peroxide
3. Electrolysis of 50% $H_{2} {SO}_{4}$
4. burning hydrogen in excess of oxygen
Hydrogen molecule differs from chlorine molecule in the following respect:
1. Hydrogen molecule is non-polar but chlorine molecule is polar
2. Hydrogen molecule is polar while chlorine molecule is non-polar
3. Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not
4. Hydrogen molecule can not participate in co-ordinate bond formation but chlorine molecule can
Which of the following pairs will not produce dihydrogen gas?
1. $Cu + HCl (dil)$
2. $Fe + H_{2} {SO}_{4}$
3. $Mg + steam$
4. $Mg + steam$
Which element forms maximum compound in chemistry?
1. $O$
2. $H$
3. $Si$
4. $C$
Which of the following produces hydrolith with dihydrogen?
1. $Mg$
2. $Al$
3. $Cu$
4. $Ca$
Hydrogen directly combines with
1. $Au$
2. $Cu$
3. $Ni$
4. $Ca$
The ratio of $C_{p} / C_{v}$ for $H_{2}$ is
1. 1.40
2. 1.67
3. 1.33
4. None of these
Abundance of $H_{2}$ in the earth's atmophere is very small. This is because
1. The earth's gravitation field is too small to hold so light an element
2. $H_{2}$ exists in ortho and para form
3. $H_{2}$ is diatomic gas
4. $H_{2}$ is not a metal
Under what conditions of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured most?
1. High temperature and high pressure
2. Low temperature and low pressure
3. High temperature and low pressure
4. Low temperature and high pressure
In which of the following compounds does hydrogen have an oxidation state of -1?
1. ${PH}_{3}$
2. ${NH}_{3}$
3. $HCl$
4. ${CaH}_{2}$
In Bosch's process, which gas is utilised for the production of hydrogen gas
1. Producer gas
2. Water gas
3. Coal gas
4. None of these
Hydrogen from $HCl$ can be prepared by
1. $Mg$
2. $Cu$
3. $P$
4. $Pt$
Which of the following statement concerning protium,deuterium and tritium is not true?
1. They are isotopes of each other
2. They have similar electronic configuration
3. They exist in nature in the ratio 1:2:3.
4. Their atomic masses are in the ratio 1:2:3.
Water contracts on heating
1. $0 ° C to 100 ° C$
2. $From 10 ° C to 20 ° C$
3. to 273K
4. $From 0 ° C to 4 ° C$
Which of the following acid is formed when ${SiF}_{4}$ reacts with water?
1. ${SiF}_{4}$
2. $H_{2} {SiF}_{4}$
3. $H_{2} {SO}_{4}$
4. $H_{2} {SiF}_{6}$
The critical temperature of water is higher than of $O_{2}$ because water molecule has
1. Fewer electrons than oxygen
2. two covalent bonds
3. V shaped
4. Dipole moment
Which of the following hydrides is electron deficient?
1. $NaH$
2. ${CaH}_{2}$
3. ${CH}_{4}$
4. $D_{2} H_{6}$
When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution the ratio of volumes of hydrogen evolved is
1. 1:1
2. 1:2
3. 2:1
4. 9:4
Water gas is
1. $CO + N_{2}$
2. $CO + {CO}_{2} + {CH}_{4}$
3. $CO + H_{2}$
4. ${CO}_{2} + H_{2}$
Temporary hardness may be removed from water by adding
1. ${CaCO}_{3}$
2. $Ca {(OH)}_{2}$
3. ${CaSO}_{4}$
4. $HCl$
Deuteroammonia( ${ND}_{3}$ ) can be prepared:
1. By heating a solution of ${NH}_{4} Cl$ in $NaOD$
2. By action of heavy water on magnesium nitride
3. By fraction of ordinary ammonia
4. None of these
Hydrogen acts as an oxidising agent in its reaction with
1. ${Br}_{2}$
2. $Ca$
3. $N_{2}$
4. $S$
Hydrogen gas is not liberated when the following metal is added to dil. $HCl$
1. $Mg$
2. $Sn$
3. $Ag$
4. $Zn$
Which of the following has the highest proton affinity?
1. Stibine( ${SbH}_{3}$ )
2. Arsine( ${AsH}_{3}$ )
3. Phosphine( ${PH}_{3}$ )
4. Ammonia( ${NH}_{3}$ )
Which of the following is the correct order of increasing enthalpy of vaporisation?
1. ${NH}_{3} < {PH}_{3} < {AsH}_{3}$
2. ${ArH}_{3} < {PH}_{3} < {NH}_{3}$
3. ${PH}_{3} < {AsH}_{3} < {NH}_{3}$
4. ${NH}_{3} < {AsH}_{3} < {PH}_{3}$
Which is true statement about $D_{2} O$ and $H_{2} O$ ?
1. $D_{2} O$ has lower dielectric constant than $H_{2} O$
2. $NaCl$ is more soluble in $D_{2} O$ than in $H_{2} O$
3. $D_{2} O$ has lower dielectric constant than $H_{2} O$ and $NaCl$ is more soluble in $D_{2} O$ than in $H_{2} O$
4. None of these
Which of the following pair of molecules have practically the same mass?
1. $D_{2} O and H_{2} O$
2. $H_{2} O and HTO$
3. $D_{2} O and HTO$
4. $DTO and HDO$
Which of the following is not a hard water?
1. Water containing ${CaCl}_{2}$
2. Water containing dil. $HCl$
3. Water containing ${MgSO}_{4}$
4. None of these
The molarity of pure water at $4 ° C$ is
1. 1 M
2. 2.5 M
3. 5 M
4. 55.5 M
Water is said to be permanently hard when it contains
1. Chloride and sulphates of $Mg$ and $Ca$
2. Bicarbonates of $Na$ and $K$
3. Carbonates of $Na$ and $K$
4. phosphates of $Na$ and $K$ .
The correct stability order of ionic hydride is
1. $LiH > NaH > KH > RbH$
2. $RbH > KH > NaH > LiH$
3. ${BaH}_{2} > {SrH}_{2} > {CaH}_{2}$
4. None of these
Point out the incorrect statement
1. Hardness of water depends upon its soap consuming power
2. Temporary hardness is due to bicarbonates of calcium and magnesium
3. Permanent hardness is due to soluble sulphates,chlorides and nitrates of $Ca$ and $Mg$ .
4. Permanent hardness can be removed by boiling water
Which substnce can not be reduced by $H_{2} O_{2}$
1. ${KMnO}_{4}$ / $H_{2} {SO}_{4}$
2. $K_{2} {Cr}_{2} O_{7}$ / $H_{2} {SO}_{4}$
3. ${Ag}_{2} O$
4. ${Fe}^{3 +}$
Which of the following statements about $H_{2} O_{2}$ is not true?
1. $H_{2} O_{2}$ is used to clean oil paintings
2. $H_{2} O_{2}$ acts as oxidising as well as reducing agent
3. Two hydroxyl groups in $H_{2} O_{2}$ lie in the same plane
4. It remains same structure in liquid and solid form
The species that does not contain peroxide ion is
1. ${PbO}_{2}$
2. $H_{2} O_{2}$
3. ${SrO}_{2}$
4. ${BaO}_{2}$
When hydrogen peroxide is added to acidified potassium dichromate, a blus colour is produced due to formation of
1. ${CrO}_{3}$
2. ${Cr}_{2} O_{3}$
3. ${CrO}_{5}$
4. ${CrO}_{4}^{2 -}$
One of the following is an incorrect statement.Point out the incorrect one.
1. $H_{2} O_{2}$ decomposes rapidly in presence of ${MnO}_{2}$
2. Ice at its melting point is lighter than water because ice crystals have hollow hexagonal arrangement of $H_{2} O$ molecules
3. $D_{2} O$ will have maximum density at $11.5 ° C$ .
4. Water gas contains greater proportion of $CO$ than that of $H_{2}$ .
Pick out the correct statement
1. By decreasing the temperaturepure para hydrogen can be obtained
2. By increasing the temperature pure ortho hydrogen can be obtained
3. By decreasing the temperature pure ortho hydrogen can be obtained
4. By increasing the temperature pure para hydrogen can be obtained
Which of the following is not true?
1. Ordinary water is electrolysed more rapidly than $D_{2} O$
2. Reaction between $H_{2}$ and ${Cl}_{2}$ is much faster than $D_{2}$ and ${Cl}_{2}$ .
3. $D_{2} O$ freezes at lower temperature than $H_{2} O$
4. Bond dissociation energy for $D_{2}$ is greater than $H_{2}$
Temporary hardness may be removed from water by adding
1. $Ca {(OH)}_{2}$
2. ${CaCO}_{3}$
3. ${CaSO}_{4}$
4. ${Na}_{2} {SO}_{4}$
Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda.When carbon dioxide is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A
1. ${CaCO}_{3}$
2. $CaO$
3. $Ca {(OH)}_{2}$
4. $Ca {({HCO}_{3})}_{2}$
Which of the following is correct about heavy water?
1. Water at $4 ° C$ having maximum density is known as heavy water.
2. It is heavier than water
3. It is formed by the combination of heavy isotope of hydrogen and oxygen
4. None of these
Permanent hardness due to ${Mg}^{2 +}$ ions is best removed by
1. $Ca {(OH)}_{2}$
2. ${Na}_{2} {CO}_{3}$
3. ${Na}_{2} {CO}_{3} + Ca {(OH)}_{2}$
4. None of these
When temporary hard water containing $Mg {({HCO}_{3})}_{2}$ is boiled the ppt formed is of
1. ${MgCO}_{3}$
2. $MgO$
3. $Mg {(OH)}_{2}$
4. None of these
Hardness producing salt, whose solubility in water decreases with rise of temperature is
1. ${CaCl}_{2}$
2. ${CaSO}_{4}$
3. $Ca {({HCO}_{3})}_{2}$
4. ${MgSO}_{4}$
Water obtained by purification with organic ion exchange resin is
1. Pure water
2. Free from only ${Ca}^{2 +}$ , ${Mg}^{2 +}$ ions
3. Free from ${HCO}_{3}^{-}$ , ${SO}_{4}^{2 -}$ and ${Cl}^{-}$ ions only.
4. None of these
In context with the industrial preparation of hydrogen from water gas ( $CO + H_{2}$ )which of the following is the correct statement?
1. $CO$ is oxidised to ${CO}_{2}$ with steam in presence of a catalyst followed by absorption of ${CO}_{2}$ in alkali
2. $CO$ and $H_{2}$ are fractionally separated using difference in their densities
3. $CO$ is removed by absoption in aqueous ${Cu}_{2} {Cl}_{2}$
4. $H_{2}$ is removed through occlusion with $Pd$ .
Triple point of water is [AIIMS 2013]
1. 273 K
2. 373 K
3. 203 K
4. 193 K
Which of the following process permanent hardness of water can be removed, by adding [AIIMS 2010]
1. Soda lime
2. Sodium carbonate
3. Washing soda
4. Sodium chloride
Which of the following is correct for hydrogen?[AIIMS 2009]
1. It can form bonds in +1 as well as -1 oxidation state
2. It is always collected at cathode
3. It has a very high ionisation potential
4. It has same electronegativity as halogens
Which of the following group of ions makes the water hard? [AIPMT/NEET 1994]
1. Sodium and bicarbonate
2. Magnesium and chloride
3. Potassium and sulphate
4. Ammonia and chloride
The volume strength of 1.5 N $H_{2} O_{2}$ solution is
1. 4.8 L
2. 5.2 L
3. 8.4 L
4. 8.8 L
Pure water can be obtained from sea water by [AIPMT/NEET 2001]
1. Centrifugation
2. Plasmolysis
3. Sedimentation
4. Reverse osmosis
Ortho and Para hydrogen differ in [AIIMS2007]
1. Proton spin
2. Electron spin
3. Nuclear charge
4. Nuclear reaction
Hydrogen can be fused to form helium at [AIIMS 2007]
1. high temperature and high pressure
2. high temperature and low pressure
3. low temperature and high pressure
4. low temperature and low pressure
Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. when carbon dioxide is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A [AIIMS 2009]
1. ${CaCO}_{3}$
2. $CaO$
3. $Ca {(OH)}_{2}$
4. $Ca {({HCO}_{3})}_{2}$
Which of the following reaction produces hydrogen?[AIIMS 2005]
1. $Mg + H_{2} O$
2. ${BaO}_{2} + HCl$
3. $H_{2} S_{4} O_{8} + H_{2} O$
4. ${Na}_{2} O_{2} + 2 HCl$
When $H_{2} O_{2}$ is oxidised, the product is [AIPMT/NEET 1999]
1. ${OH}^{-}$
2. $O_{2}$
3. $O^{2 -}$
4. ${HO}^{2 -}$
Which one of the following pairs of substances on reaction will not evolve hydrogen gas? [AIPMT/NEET 1998]
1. Iron and sulphuric acid(aq)
2. Iron and steam
3. Sodium and ethyl alcohal
4. Copper and hydrochloric acid(aq)
The dielectric constant of water is 80. the electrostatic force of attraction between sodium and chloride will be [AIPMT/NEET 1994]
1. reduced to 1/80 in water and than in air
2. reduced to 1/40 in water than in air
3. will be increased to 80 in water than in air
4. will remain unchanged
The $O - O - H$ bond angle in $H_{2} O_{2}$ is
1. $106 °$
2. $109 ° 28'$
3. $120 °$
4. $97 °$