Most covalent compound among the following is :

1.	AlF3	2.	AlCl3
3.	AlBr3	4.	AlI3

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

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

The molecule having the smallest bond angle is-

An electron-deficient compound among the following is:

A paramagnetic molecule among the following 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: 

The correct statement about hydrolysis of ${\mathrm{BCl}}_3$ and ${\mathrm{NCl}}_3$ is-

1. ${\mathrm{NCl}}_3$ is hydrolysed and gives $\mathrm{HOCl}$ but ${\mathrm{BCl}}_3$ is not hydrolysed

2. Both ${\mathrm{NCl}}_3$ and ${\mathrm{BCl}}_3$ on hydrolysis gives $\mathrm{HCl}$

3. ${\mathrm{NCl}}_3$ on hydrolysis gives $\mathrm{HOCl}$  but ${\mathrm{BCl}}_3$ gives $\mathrm{HCl}$

4. Both ${\mathrm{NCl}}_3$ and ${\mathrm{BCl}}_3$ on hydrolysis gives $\mathrm{HOCl}$