1. A
   (a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)
2. B
   (a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)
3. C
   (a) - (iii), (b) - (ii), (c) - (iv), (d) - (i)
4. D
   (a) - (i), (b) - (iii), (c) - (ii), (d) - (iv).

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1. A
   1 - D, 2 - A, 3 - C, 4 - B
2. B
   1 - A, 2 - C, 3 - B, 4 - D
3. C
   1 - B, 2 - D, 3 - A, 4 - C
4. D
   1 - C, 2 - B, 3 - D, 4 - A.

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1. A
   1 - B, 2 - C, 3 - D, 4 - A
2. B
   1 - D, 2 - C, 3 - A, 4 - C
3. C
   1 - A, 2 - C, 3 - B, 4 - D
4. D
   1 - C, 2 - B, 3 - D, 4 - A.

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1. A
   1 - C, 2 - A, 3 - B, 4 - D
2. B
   1 - D, 2 - A, 3 - C, 4 - B
3. C
   1 - A, 2 - C, 3 - D, 4 - B
4. D
   1 - B, 2 - D, 3 - A, 4 - C.

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1. A
   1 - B, 2 - D, 3 - A, 4 - C
2. B
   1 - C, 2 - B, 3 - D, 4 - A
3. C
   1 - D, 2 - A, 3 - C, 4 - B
4. D
   1 - A, 2 - C, 3 - B, 4 - D.

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1. A
   Law of Simple proportions
2. B
   Law of conservation of mass
3. C
   Law of multiple proportions
4. D
   Law of constant proportions.

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1. A
   Trivalent
2. B
   Bivalent
3. C
   Tetravalent
4. D
   Monovalent.

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1. A
   1, Hydrogen ion
2. B
   1, Deuterium
3. C
   2, Tritium
4. D
   9, Fluorine.

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1. A
   Isotone
2. B
   Isotope
3. C
   Isobar
4. D
   Isomer.

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1. A
   Statement A
2. B
   BothstatementA and statement B
3. C
   Neither statement A nor statement B
4. D
   Statement B.

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1. A
   Both A and B
2. B
   Statement B
3. C
   Statement A
4. D
   Neither A nor B.

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1. A
   All of these
2. B
   C and D
3. C
   B and C
4. D
   A, B and D.

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1. A
   All of these
2. B
   B and C
3. C
   B and D
4. D
   A and D.

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1. A
   (a) and (b) are correct
2. B
   All of these
3. C
   (b), (b) and (c) are incorrect
4. D
   (b) and (c) are incorrect.

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1. A
   A and C
2. B
   All of these
3. C
   C and D
4. D
   B and C.

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1. A
   Atoms of the same element have different masses.
2. B
   Atoms of different elements may have different masses.
3. C
   None of these
4. D
   Atoms have been found to be made up of sub-atomic particles.

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1. A
   All of these
2. B
   (c) and (d) are correct
3. C
   (a) and (b) are correct
4. D
   (a), (b) and (c) are correct.

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1. A
   All of these
2. B
   (c) and (d) are correct
3. C
   (a) and (b) are correct
4. D
   (a), (b) and (c) are correct.

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1. A
   The law of constant proportions was stated by A Lavoisier.
2. B
   The molecules of noble gas elements are diatomic in nature.
3. C
   Dalton was the first to state that the smallest indivisible portion of matter is an atom.
4. D
   The law of conservation of mass was given by Louis Proust.

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1. A
   The material is mixed compound and all three samples have the same composition.
2. B
   The material is pure compound and all three samples have a different compositions.
3. C
   The material is a mixed compound and all three samples have different compositions.
4. D
   The material is pure compound and all three samples have the same composition.

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1. A
   $1.00\text{g}$ of NaCl + $100\text{g}$ of water
2. B
   $0.10\text{g}$ of NaCl + $99.99\text{g}$ of water
3. C
   $0.01\text{g}$ of NaCl + $99.99\text{g}$ of water
4. D
   $0.11\text{g}$ of NaCl + $100\text{g}$ of water

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1. A
   Melting of ice
2. B
   The cooking of vegetables.
3. C
   Freezing of water
4. D
   Drying of wet clothes in sun light.

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1. A
   egg white settles down at the bottom
2. B
   a transparent solution is formed
3. C
   a translucent mixture is formed
4. D
   egg white floats on the surface of the water.

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1. A
   a corrosion and it is a physical as well as chemical change
2. B
   dissolution and it is a physical change
3. C
   dissolution and it is a chemical change
4. D
   corrosion and it is a chemical change.

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1. A
   Breaking of ice cubes into small pieces
2. B
   Adding sodium metal to water
3. C
   Agitating a detergent with water in a washing machine
4. D
   Crushing of a marble tile into small particles.

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