PH₃ forms bubbles when passed slowly through water but NH₃ gets dissolved in water, because: 

The bonding present in nitrogen molecules is:
1. \(p\pi-p\pi\)
2. \(p\pi-d\pi\)
3. \(d\pi-d\pi\)
4. Only sigma bond

NH₃ forms a hydrogen bond but PH₃ does not because:  

Match the name of process given in Column I with the name of compound given in Column II and mark the correct option.

 Match the formulas of oxides given in Column I with the type of oxide given in Column II and mark the correct option.

Codes

The respective oxidation states of P in H₄P₂O₅, H₄P₂O₆, and H₄P₂O₇ are: 

A balanced chemical equation for the reaction showing catalytic oxidation of NH₃ by atmospheric oxygen is:

Nitrogen gas is liberated by the thermal decomposition of:

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 of the above. 

A brown-coloured mixture of two gases is obtained by reducing 6 N nitric acid with metallic copper. This mixture on cooling condenses to a blue liquid which on freezing (-30 ^oC) gives a blue solid. The correct statement for the blue liquid or solid is: 

The correct structure of pyrophosphoric acid is:

1.		2.
3.		4.