Given below are two statements: 

Assertion (A):	Conc HNO3 makes iron passive.
Reason (R):	HNO3 forms a protective layer of ferric nitrate on the surface of the iron.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Given below are two statements: 

If the boiling point of H₂O is 373 K, the boiling point of H₂S will be:

1. Greater than 300 K but less than 373 K
2. Less than 300 K
3. More than 373 K
4. Equal to 373 K

Which of the following compounds, on hydrolysis, produces a base as one of its products?

1.  NF₃

2.  NCl₃

3.  PCl₃

4. BCl₃

When sodium thiosulphate is reacted with I₂ , then the product of sulphur will be:

1. $N{a}_{2}S{O}_3$

2. $N{a}_{2}S{O}_4$

3. $N{a}_2{S}_4{O}_6$

4. $S{O}_2$

Which is not the product of hydrolysis of  XeF₆ :

1. XeO₃ 

2. XeO₂F₂

3. XeOF₄ 

4. XeOF₂

The most volatile halogen acid is

1. HF

2. HCl

3. HBr

4. HI

${\mathrm{l}}_2$ reacts with aqueous ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ to give ${\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$ and Nal. The products of the reaction of Cl₂ with aqueous ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ are:

1.  ${\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$ + NaCl

2.  ${\mathrm{NaHSO}}_4$ + HCl

3.  ${\mathrm{NaHSO}}_3$ + HCl

4.  ${\mathrm{NaHSO}}_3$ + NaCl