The least polar bond is present in which of the following?

1.	O-F	2.	P-F
3.	Si-N	4.	B-F

The correct order of increasing s-character (in percentage) in the hybrid orbitals of the following molecules/ions is:

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

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

The molecular geometry that is least likely to result from a trigonal bipyramidal electron geometry is:

On the left are given decreasing orders of elements for a certain property and on right side is given the property. The incorrect order for the given properties is:

1. ${\mathrm{AlF}}_3>\mathrm{MgO}>{\mathrm{MgF}}_2$    : Lattice energy

2. $\mathrm{Li}>\mathrm{Na}>\mathrm{Al}>\mathrm{Mg}$       : Electron affinity

3. ${\mathrm{PF}}_5>$ ${\mathrm{SF}}_6$ $>$ ${\mathrm{SiF}}_4$    : Lewis acidic character

4. ${\mathrm{SiCl}}_4>{\mathrm{SiBr}}_4$ $>{\mathrm{SiI}}_4$   : Decreasing ionic character

O$—$O bond length ($\mathrm{in} \stackrel{°}{\mathrm{A}}$ ) in  $H_2{O}_2$ and $O_2{F}_2$ is respectively:

The correct order of 'S$—$O' bond length is:

A compound having a metal-to-metal bond is:

1. Cupric chloride           

2. Stannous chloride

3. Mercurous chloride     

4. Mercuric chloride

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