The chemical formula of 'laughing gas' is

1.  NO

2.  ${\mathrm{N}}_2\mathrm{O}$

3.  ${\mathrm{N}}_2{\mathrm{O}}_4$

4.  ${\mathrm{N}}_2{\mathrm{O}}_5$

1. (X) = Phosphorous acid, (Y) = Metaphosphoric acid

2. (X) = Pyrophosphoric acid, (Y) = Metaphosphoric acid

3. (X) = Metaphosphoric acid, (Y) = Pyrophosphoric acid

4. (X) = Metaphosphoric acid, (Y) = Phosphene gas

Which one of the following compounds on strong heating evolves ammonia gas ?

1. ${\left({\mathrm{NH}}_4\right)}_{2}S{O}_4$

2. ${\mathrm{HNO}}_3$

3. ${\left({\mathrm{NH}}_4\right)}_{2}C{r}_2{O}_7$

4. ${\mathrm{NH}}_4{\mathrm{NO}}_3$

Match List - I with List - II

1. I-a, II-b, III-d, IV-c

2. I-b, II-c, III-a, IV-d

3. I-a, II-d, III-c, IV-b

4. I-a, II-c, III-b, IV-d 

Ammonia can be dried by

1. conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$

2. ${\mathrm{P}}_4{\mathrm{O}}_{10}$

3. CaO

4. anhydrous ${\mathrm{CaCl}}_2$

There is no S-S bond in

1. ${\mathrm{S}}_2{\mathrm{O}}_4^{2-}$

2. ${\mathrm{S}}_2{\mathrm{O}}_5^{2-}$

3. ${\mathrm{S}}_2{\mathrm{O}}_3^{2-}$

4. ${\mathrm{S}}_2{\mathrm{O}}_7^{2-}$

Which of the following leaves no residue on heating ?

1. $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$

2. ${\mathrm{NH}}_4{\mathrm{NO}}_3$

3. $\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2$

4. ${\mathrm{NaNO}}_3$

Which amongst the following reactions cannot be used for the preparation of the halogen acid?

1. $2\mathrm{KBr}+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{conc}.\right)\to {\mathrm{K}}_2{\mathrm{SO}}_4+2\mathrm{HBr}$

2. $2\mathrm{NaCl}+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{conc}.\right)\to {\mathrm{NaHSO}}_4+\mathrm{HCl}$

3. ${\mathrm{NaHSO}}_4+\mathrm{NaCl}\to {\mathrm{Na}}_2{\mathrm{SO}}_4+\mathrm{HCl}$

4. ${\mathrm{CaF}}_2+{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{conc}.\right)\to {\mathrm{CaSO}}_4+2\mathrm{HF}$

Which of the following pair has bleaching property ?

1. ${\mathrm{O}}_3 \mathrm{and} {\mathrm{NO}}_2$

2. ${\mathrm{O}}_3 \mathrm{and} {\mathrm{H}}_2\mathrm{S}$

3. ${\mathrm{SO}}_2 \mathrm{and} {\mathrm{Cl}}_2$

4. ${\mathrm{Cl}}_2 \mathrm{and} {\mathrm{NO}}_2$

Nitrogen is liberated by the thermal decomposition of only

1. ${\mathrm{NH}}_4{\mathrm{NO}}_2$

2. ${\mathrm{NaN}}_3$

3. ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$

4. All the three