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particles normally exist in a combined form which gives us various forms of matter it is said by ...............
1. maharishi kannad
2. pakudha katyayama
3. both
4. none of these
who laid the foundation of chemical sciences by establishing two important laws of chemical combination ?
1. pakadha katyayama
2. Democritius and leucippus
3. Antoine L. lavoisiser
4. none of these
mass states that mass can neither be created nor destroyed in a chemical reaction. this is law of .........................
1. conservation of mass
2. constant proportion
3. conservation of energy
4. none of these
In ammonia, nitrogen and hydrogen are always present in the ratio ................... by mass
1. 1:8
2. 8:9
3. 14: 3
4. none of these
The law of constant proportions which is also known as the law of .................
1. definite proportion
2. fixed proportion
3. mass proportion
4. none of these
The smallest particles of matter are ..................
1. matter
2. compound
3. atom
4. none of these
According to Dalton’s atomic theory, all matter, whether an element, a compound or a mixture is composed of small particles called
1. atom
2. matter
3. compound
4. none of these
modern day symbol of atom of carbon is .....................
the name copper was taken from ..............
1. cyprus
2. ferrum
3. kalium
4. none of these
full form of IUPAC............................
1. international union of physical and applied chemistry
2. international union of pure and applied chemistry
3. indian union of pure and applied chemistry
4. none of these
atomic mass unit, ............................. isotope was chosen as the standard reference for measuring atomic masses
1. carbon-12
2. carbon -14
3. carbon- 11
4. none of these
atomic mass of chlorine is
1. 40
2. 32
3. 35
4. 35.5
A ..................... can be defined as the smallest particle of an element or a compound that is capable of an independent existence and shows all the properties of that substance
1. atom
2. compound
3. molecule
4. none of these
The number of atoms constituting a molecule is known as its ...................
1. atomicity.
2. molicity
3. number
4. none of these
atomicity of phosphorous is .........................
1. monoatomic
2. diatomic
3. tetra atomic
4. poly atomic
A negatively charged ion is called an ...................
1. cation
2. anion
3. ion
4. none of these
The combining power (or capacity) of an element is known as its ..............
1. valency
2. valence
3. balance
4. none of these
formula of calcium hydroxide is .....................
1. CaOH2
2. Ca(OH)2
3. CaCO3
4. none of these
The......................... of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance.
1. molecular mass
2. atomic mass
3. element mass
4. none of these
The number of particles (atoms, molecules or ions) present in 1 mole of any substance is fixed, with a value of
1. 6.022 × 1024
2. 6.024 × 10-12
3. 6.022 × 1023
4. none o fthese
The word “mole” was introduced around 1896 by ...
1. wilhelm joseph
2. joseph ostwal
3. ostwal joseph
4. Wilhelm Ostwal
Clusters of atoms that act as an ion are called ..............
1. diatomic ion
2. polyatomic ion
3. monoactomic ion
4. none of these
The Avogadro constant 6.022 × 1023 is defined as the number of atoms in exactly .........g of carbon-12.
1. 13
2. 12
3. 16
4. 14
Mass of 1 mole of a substance is called its ....................
1. native mass
2. ionic mass
3. molar mass
4. none of these
symbol of potassium is
1. k
2. p
3. po
4. ka
latin name of iron is
1. ferric
2. ferrum
3. iron
4. none of these
symbol of gold is
1. gu
2. ag
3. au
4. none of these
atomic mass of sodium is
1. 23
2. 24
3. 17
4. 25
symbol of phosphorous is
4. none of these
symbol of sulphur is
4. none of these

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