Solubillity of alkali metal fluorides increases down the group select correct explanation for given statement :

(1) Hydration energy increase and lattice energy decrease down the group 

(2) Both energy decrease down the group but decrease in hydration energy is rapid

(3) Both energy decrease down the group but decrease in lattice energy is more

(4) both energy decrease down the group but increase in hydration energy is rapid

In which of the following compounds B$—$F bond length is shortest ?

(a) $B{F_4}^{-}$       (b) $B{F}_3\leftarrow N{H}_3$

(c) $B{F}_3$         (d) $B{F}_3\leftarrow N{\left(C{H}_3\right)}_3$

In terms of polar character which of the following order is correct?

1. $N{H}_3<H_{2}O<HF<H_{2}S$   

2. $H_{2}S<N{H}_3<H_{2}O<HF$

3. $H_{2}O<N{H}_3<H_{2}S<HF$   

4. $HF<H_{2}O<N{H}_3<H_{2}S$

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) $C{S}_{{}^2}$

Cis-butene dioic acid $\stackrel{{\mathrm{K}}_{{\mathrm{a}}_1}\{-{\mathrm{H}}^{+}\}}{\rightleftharpoons }{{\mathrm{X}}^{-}}_1\stackrel{{\mathrm{K}}_{{\mathrm{a}}_2}\{-{\mathrm{H}}^{+}\}}{\rightleftharpoons }{\mathrm{X}}_2^{2-}$

Trans-butene dioic acid $\stackrel{{\mathrm{K}}_{{\mathrm{a}}_1}\text{'}\{-{\mathrm{H}}^{+}\}}{\rightleftharpoons }{{\mathrm{Y}}^{-}}_1\stackrel{{\mathrm{K}}_{{\mathrm{a}}_2}·\{-{\mathrm{H}}^{+}\}}{\rightleftharpoons }{\mathrm{Y}}_2^{2-}$

The incorrect statement regarding above the information is:

(1) ${\mathrm{X}}_2^{2-}$ species is more basic than ${\mathrm{Y}}_2^{2-}$ species 

(2) ${\mathrm{X}}_1^{-}$ species is more basic than ${\mathrm{Y}}_1^{-}$ species

(3) ${\mathrm{K}}_{\mathrm{a}1}$ is greater than $\mathrm{K}{\text{'}}_{\mathrm{a}2}$ 

(4) $\mathrm{K}{\text{'}}_{\mathrm{a}2}$ is greater than $\mathrm{K}{\text{'}}_{\mathrm{a}2}$

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 pair of elements can form an ionic compound?