The variation of the boiling point of the hydrogen halides is in the order HF > HI > HBr >

HCl. What explains the higher boiling point of hydrogen fluoride?

1. The electronegativity of fluorine is much higher than for other elements in the group

2. There is strong hydrogen bonding between HF molecules

3. The bond energy ol HF molecules is greater than in other hydrogen halides

4. The effect of nuclear shielding is much reduced in fluorine which polarises the HF

molecule

The product obtained as a result of a reaction of nitrogen with CaC₂ is:

1. CaCN         

2. CaCN₃

3. Ca₂CN       

4. CaCN₂

Nitrogen gas is liberated by thermal decomposition of :

(1) ${\mathrm{NH}}_4{\mathrm{NO}}_2$                                 

(2) ${\mathrm{NaN}}_3$

(3) ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$                           

(4) All    

Consider the following sequence of reaction.

$\mathrm{Na}+{\mathrm{NH}}_3\left(\mathrm{g}\right)\underset{}{\to }\left[\mathrm{X}\right]\stackrel{{\mathrm{N}}_2\mathrm{O}}{\to }\left[\mathrm{Y}\right]\stackrel{\mathrm{Heat}}{\to }\underset{\mathrm{Gas} \mathrm{Pure}}{\left[\mathrm{Z}\right]}$

Identify [Z] gas :

$\left(\mathrm{a}\right) {\mathrm{N}}_2$

$\left(\mathrm{b}\right) {\mathrm{NH}}_3$

$\left(\mathrm{c}\right) {\mathrm{O}}_2$

$\left(\mathrm{d}\right) {\mathrm{H}}_2$

Which of the following compound does not produce oxyacid of central atom on hydrolysis?

(1) ${\mathrm{BF}}_3$                           

(2) ${\mathrm{NCl}}_3$

(3) ${\mathrm{SF}}_4$                           

(4) ${\mathrm{PCl}}_5$

In which of the following reaction product does not contain 'Peroxy' linkage?

1. $2\mathrm{OF}\stackrel{\mathrm{Dimerisation}}{\to }$  

2. ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_8\stackrel{+{\mathrm{H}}_2\mathrm{O}}{\to }$

3. $2\mathrm{Na}\underset{∆}{\overset{\mathrm{excess} {\mathrm{O}}_2}{\to }}$   

4. None of these 

$\mathrm{MF}+{\mathrm{XeF}}_4 \stackrel{}{\to }\text{'}\mathrm{A}\text{'} ({\mathrm{M}}^{+}=\mathrm{Alkali} \mathrm{metal} \mathrm{cation})$

The state of hybridisation of the central atom in 'A' and shape of the species are:

$\left(\mathrm{a}\right) s{p}^{3}d, \mathrm{TBP}$

$\left(\mathrm{b}\right) s{p}^{\mathit{3}}{d}^3, \mathrm{pentagonal} \mathrm{planar}$

$\left(\mathrm{c}\right) s{p}^{\mathit{3}}{d}^2, \mathrm{distorted} \mathrm{octahedral}$

$\left(\mathrm{d}\right) \mathrm{No} \mathrm{compound} \mathrm{formed} \mathrm{at} \mathrm{all}$

${\mathrm{XeF}}_6$ dissolves in anhydrous $\mathrm{HF}$ to give a good conducting solution that contains-

1. H⁺ and \(XeF_{7}^{-}\) ions
2. \(HF_{2}^{-}\) and \(XeF_{5}^{+}\) ions
3. \(HXeF_{6}^{+}\) and F^- ions
4. None of the above

Incorrect statement regarding following reactions is :

(a) 'X' is explosive

(b) 'Y' is an oxyacid of xenon

(c) Both are example of non-redox reaction

(d) ${\mathrm{XeF}}_6$ can undergo partial hydrolysis

Which of the following noble gas does not form clathrate compound?

$\left(\mathrm{a}\right) \mathrm{Kr}$

$\left(\mathrm{b}\right) \mathrm{Ne}$

$\left(\mathrm{c}\right) \mathrm{Xe}$

$\left(\mathrm{d}\right) \mathrm{Ar}$