The correct order of boiling point among the following is:

1. ${\mathrm{T}}_2<{\mathrm{D}}_2<{\mathrm{H}}_2$                                 

2. n-pentane<neo pentane

3. Xe < Ar < He

4. m-nitrophenol > o-nitrophenol

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

The linear structure is possessed by :

(1) $SnC{l}_2$

(2) $NC{O}^{-}$

(3) $N{O_2}^{+}$

(4) $C{S}_{{}^2}$

In which of the following compounds octet is complete and incomplete for all atoms:

         \(Al_2Cl_{6}\)      \(Al_{2} \left(CH_{3}\right)_{6}\)      \(AlF_{3}\)         Dimer of \(BeCl_{2}\)  Dimer of \(BeH_{2}\)

(1)      IC               IC                   IC                     C                         C

(2)      C                IC                   IC                     C                         IC

(3)      C                IC                    C                     IC                        IC

(4)      IC                C                    IC                    IC                        IC

where C denotes Complete and IC incomplete.

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 is not best representation of the H-bond?

(1)                        

(2) 

(3)                    

4. None of the above

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

The type of molecular forces of attraction present in the following compound is:

The species showing $p\pi$-$d\pi$  overlapping is :

1. $N{O_3}^{-}$

2. $P{O_4}^{3-}$

3. $C{O_3}^{2-}$

4. $N{O_2}^{-}$

Which of the following interaction lies in the range of 8 - 42 kJ/mol?

1. ${\mathrm{H}}_2...{\mathrm{H}}_2\mathrm{O}$                               

2. HCl...HCI

3. ${\mathrm{H}}_2\mathrm{O}$...HF                                 

4. all