An electron-deficient compound among the following is:

1.	(SiH3)2	2.	(BH3)2
3.	PH3	4.	(CH3)2

A paramagnetic molecule among the following is:

Which of the following species has a bond angle of \(120^\circ\)?
1. \({SF}_6\)
2. \(NCl_3\)
3. \(BCl_3\)
4. \(PH_3\)

Most covalent compound among the following is :

Which of the following is a paramagnetic compound?

1. ${\mathrm{N}}_2$

2. ${\mathrm{H}}_2$

3. ${\mathrm{Li}}_2$

4. ${\mathrm{O}}_2$

The correct order of acidic strength is :

1. ${\mathrm{Cl}}_2{\mathrm{O}}_7>{\mathrm{SO}}_2>{\mathrm{P}}_4{\mathrm{O}}_{10}$                   

2. ${\mathrm{CO}}_2>{\mathrm{N}}_2{\mathrm{O}}_5>{\mathrm{SO}}_3$

3. ${\mathrm{Na}}_2\mathrm{O}>\mathrm{MgO}>{\mathrm{Al}}_2{\mathrm{O}}_3$                   

4. ${\mathrm{K}}_2\mathrm{O}>\mathrm{CaO}>\mathrm{MgO}$

The molecule having the smallest bond angle is-

Which of the following pair of elements can form an ionic compound?

The shape of $\mathrm{Xe}{{\mathrm{F}}_3}^{+}$ is:

The total number of possible resonance forms for the nitrate ion, ($\mathrm{N}{{\mathrm{O}}_3}^{-}$) is: