1. A
   A and B
2. B
   B and D
3. C
   B and C
4. D
   B and C

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

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

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1. A
   (iii) and (iv)
2. B
   (ii) and (iv)
3. C
   (i) and (iv)
4. D
   (i) and (iii)

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

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1. A
   A neutron is slightly heavier than a proton.
2. B
   Neutrons were unknown at the time when Rutherford performed the scattering experiment.
3. C
   Most of the space in atom is empty.
4. D
   Proton is a universal particle.

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1. A
   (i) and (iii)
2. B
   (i) and (iv)
3. C
   (i), (iii) and (iv)
4. D
   (i), (ii) and (iii)

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1. A
   An atom has equal number of electrons and protons.
2. B
   An atom has equal number of electrons and neutrons.
3. C
   An atom has equal number of electrons, protons and neutrons.
4. D
   An atom has equal number of protons and neutrons.

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1. A
   $\text{Na}^+$ has atomic number equal to 10 and mass number 23
2. B
   $\text{Na}^+$ has atomic number equal to 11 and mass number 23
3. C
   $\text{Na}^+$ has atomic number equal to 11 and mass number 22
4. D
   $\text{Na}^+$ has atomic number equal to 10 and mass number 22

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

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

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

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1. A
   (C)
2. B
   (A)
3. C
   (D)
4. D
   (B)

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1. A
   (ii) and (iv)
2. B
   (i) and (iii)
3. C
   (i) and (iv)
4. D
   (ii) and (iii)

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

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1. A
   A (iii), B (ii), C (i)
2. B
   A (ii), B (i) C (iii)
3. C
   A (iii), B (i), C (ii)
4. D
   A (i), B (ii), C (iii)

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1. A
   (i) and (iv)
2. B
   only (i)
3. C
   (i) and (iii)
4. D
   (i) and (ii)

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1. A
   It is highly unstable in nature.
2. B
   Its charge is neutral.
3. C
   It is a neutral particle.
4. D
   It is present in the nucleus of an atom.

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1. A
   $\text{NaSO}_4$
2. B
   $\text{NaS}$
3. C
   $\text{CaCl}$
4. D
   $\text{BiPO}_4$

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

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1. A
   40 g
2. B
   52 g
3. C
   23 g
4. D
   46 g

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1. A
   $\text{M}_2\text{SO}_4 \cdot 3\text{H}_2\text{O}$
2. B
   $\text{MSO}_4 \cdot 5\text{H}_2\text{O}$
3. C
   $\text{M}_2\text{SO}_4 \cdot 2\text{H}_2\text{O}$
4. D
   $\text{MSO}_4 \cdot \text{H}_2\text{O}$

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1. A
   i, iiand ivonly
2. B
   i, iiand iii only
3. C
   iii and ivonly
4. D
   i, ii and iii only.

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1. A
   16 : 1
2. B
   8 : 1
3. C
   1 : 16
4. D
   1 : 8 or 2 : 16

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1. A
   When energy is either given to, or taken out from the system
2. B
   Without any energy change
3. C
   Only when energy is taken out from the system
4. D
   Only when energy is given to the system.

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