1. A
   $\text{Ni}$
2. B
   $\text{N}$
3. C
   $\text{N}_2$
4. D
   $\text{N}^*$

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1. A
   $\text{Ir}$
2. B
   $\text{Fe}$
3. C
   $\text{Mg}$
4. D
   $\text{I}$

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1. A
   72
2. B
   44
3. C
   28
4. D
   99.

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1. A
   $\text{P}$
2. B
   $\text{PSO}_4$ and $\text{P}_3(\text{PO}_4)_2$
3. C
   $\text{P(SO}_4)_2$ and $\text{P(PO}_4)_2$
4. D
   $\text{PSO}_4$ and $\text{P}_3(\text{PO}_4)_2$

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1. A
   $\text{Sd}$
2. B
   $\text{K}$
3. C
   $\text{So}$
4. D
   $\text{Na}$

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1. A
   111 u
2. B
   123 u
3. C
   124 u
4. D
   137 u.

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1. A
   Monoatomic and diatomicrespectively
2. B
   Diatomic and diatomic respectively.
3. C
   Diatomic and monoatomic respectively.
4. D
   Monoatomic and mono atomic respectively.

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

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1. A
   200 g
2. B
   50 g
3. C
   100 g
4. D
   5 g.

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1. A
   4.4 g
2. B
   11.0 g
3. C
   44.0 g
4. D
   22.0 g.

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1. A
   $\text{Ca(OH)}_2$
2. B
   $\text{CaCl}_2$
3. C
   $\text{CaO}$
4. D
   $\text{CaCO}_3$.

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1. A
   i and iiionly
2. B
   ii and ivonly
3. C
   iv only
4. D
   i only.

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

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1. A
   5
2. B
   3
3. C
   2
4. D
   1.

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

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1. A
   $\text{CaP}$
2. B
   $\text{Ca}_3(\text{PO}_4)_2$
3. C
   $\text{CaCl}_2$
4. D
   $\text{Ca}_3\text{P}_2$.

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

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

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

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

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

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

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