Among the following molecules, 

(i) $\stackrel{..}{X}e{O}_3$

(ii) $\stackrel{..}{X}eO{F}_4$

(iii) $\stackrel{..}{X}e{F}_6$

Those having the same number of lone pairs on Xe are

1. (i) and (ii) only

2. (i) and (iii) only

3. (ii) and (iii) only

4. (i), (ii) and (iii) only

Which of the following contains salts of H₃PO₃?

I. NaH₂PO₃    II. Na₂HPO₃    III. Na₃PO₃  

1. I, and II only

2. I, II, and III

3. II and III only

4. III only

Which of the following statements is false?

1. ONCl and ${\mathrm{ONO}}^{-\hspace{0.17em}}$are isoelectronic.

2. ${\mathrm{O}}_3$ molecule is bent

3. Ozone is violet-black in solid-state

4. Ozone is diamagnetic gas

Element/s that form pπ - pπ multiple bonds with themselves, as well as with carbon and oxygen are:

1. P, As

2. N, As

3. N, P

4. N

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. 

Which of the following compound does not exist?

1. XeOF₄

2. NeF₂

3. XeF₂

4. XeF₆ 

P forms multiple bonds in POCl₃ by using

1. $p\mathrm{\pi }-\mathrm{p\pi }$

2. $d\mathrm{\pi }-\mathrm{d\pi }$

3. $p\mathrm{\pi }-\mathrm{d\pi }$

4. None of the above.

Which of the following statements about phosphorus is false?
1. It is non-metal.
2. It exists as a tetrahedral molecular solid.
3. It is less reactive than nitrogen.
4. P-P bond is much weaker than $N\equiv N$ bond.

The basicity of the acids H₃PO₂, H₃PO₃, H₃PO₄  and H₄P₂O₇  are, respectively:

1. 1 , 2 , 3 , 7
2. 2 , 3 , 4 , 7
3. 1 , 2 , 3 , 4
4. 1 , 2 , 3 , 5