ATOMIC STRUCTURE

The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of ____________?
1. reciprocal proportion
2. definite proportion
3. multiple proportion
4. conservation of mass
Cathode rays are made up of ___________
1. neutral particles
2. positively charged particles
3. negatively charged particles
4. None of the above
In water, hydrogen and oxygen are combined in the ratio of _______by mass
1. 1:8
2. 8:1
3. 2:3
4. 1:3
anode rays are made up of ___________
1. neutral particles
2. positively charged particles
3. negatively charged particles
4. None of the above
The nucleons are
1. Protons and electrons
2. Neutrons and electrons
3. Protons and neutrons
4. None of these
The electrons present in the outermost shell are called
1. Valency electrons
2. Octate electrons
3. Duplet electrons
4. Valence electrons
The cathode ray experiment was done for the first time by
1. J.J. Thomson
2. John Dalton
3. Goldstein
4. Rutherford
The charge on an electron is
1. 1.6 x 10^-6 coulombs
2. 1.6 x 10^-20 coulombs
3. 1.6 x 10^-19 coulombs
4. 1.6 x 10^-16 coulombs
By whom was neutron discovered?
1. Bohr
2. Chadwick
3. Rutherford
4. Dalton
In an atom valence electron are present in
1. Outermost orbit
2. Next to outermost orbit
3. First orbit
4. Any one of its orbit
Which of the following statements is incorrect for cathode rays?
1. They move in straight line
2. Their nature depends upon the nature of gas present in the discharge tube.
3. They cost shadow of solid objects placed in their path
4. They get deflected towards positive charge
The isotopes of an element have
1. Same number of neutrons
2. Same atomic number
3. Same mass number
4. None of these
Which of the following pairs are isotopes?
1. Oxygen and ozone
2. Ice and steam
3. Nitric oxide and nitrogen dioxide
4. Hydrogen and deuterium
Which of the following have equal number of neutrons and protons?
1. Hydrogen
2. Deuterium
3. Fluorine
4. Chlorine
Which one of the following statement is not true?
1. Most of the space in an atom is empty
2. The total number of neutrons and protons is always equal in a neutral atom
3. The total number of electrons and protons in an atom is always equal
4. The total number f electrons in any energy level can be calculated by the formula 2n2
How many electrons in a Hydrogen (H) atom:
1. One
2. Two
3. Three
4. Four
Electrons have
1. negative charge
2. positive charge
3. no charge
4. both charges
Neutrons have
1. negative charge
2. positive charge
3. no charge
4. both charges
Particles which have equal mass are
1. protons and electrons
2. protons and neutrons
3. neutrons and electrons
4. photons and protons
A particle in the nucleus with no electrical charge is known as
1. atomic number
2. isotope
3. electron
4. neutron
Cathode rays are deflected by?
1. Neither electric nor magnetic field.
2. An electric field only
3. Both electric and magnetic field
4. A magnetic filed only
Anode rays were discovered by?
1. J. Stoney
2. Goldstein
3. Rutherford
4. J.J. Thomson
The nature of positive rays depends on?
1. The nature of residual gas
2. The nature of electrode
3. The nature of discharge tube.
4. All of above.
The heaviest particle among all the four given particles is?
1. Electron
2. Neutron
3. Proton
4. Meson
Which of the following statement Is wrong about electron?
1. Its motion is affected by magnetic field.
2. It emits energy while moving in orbit.
3. It has wave like property
4. It is a particle
Atomic mass of an element is equal to the sum of
1. Electron and proton
2. Electron and neutron
3. Proton and neutron
4. None of the above
Neutron is a fundamental particle which carries?
1. A charge —1 unit and no mass.
2. A charge of +1 and mass of l unit
3. No charge and no mass.
4. No charge and mass of one unit
Law of conservation of mass states that _____________
1. the total mass of the products is equal to the total mass of the reactants.
2. a pure chemical compound the elements are always present in definite proportions by mass
3. the total mass of the products is equal to the total mass of the Precipitate .
4. None
If an atom loses one or more electrons during a chemical reaction and have more
number of positive charge, it is called __________
1. Anions
2. Cations
3. Anode
4. Cathode
If an atom gains one or more electrons during a chemical reaction, it will have more number of negative charge on it?
1. Anions
2. Cations
3. Ions
4. None

ATOMIC STRUCTURE

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