Consider the following sequence of reaction.

$\mathrm{Na}+{\mathrm{NH}}_3\left(\mathrm{g}\right)\underset{}{\to }\left[\mathrm{X}\right]\stackrel{{\mathrm{N}}_2\mathrm{O}}{\to }\left[\mathrm{Y}\right]\stackrel{\mathrm{Heat}}{\to }\underset{\mathrm{Gas}<mspace\; width="1em"></mspace>\mathrm{Pure}}{\left[\mathrm{Z}\right]}$

Identify [Z] gas :

$\left(\mathrm{a}\right)<mspace\; width="1em"></mspace>{\mathrm{N}}_2$

$\left(\mathrm{b}\right)<mspace\; width="1em"></mspace>{\mathrm{NH}}_3$

$\left(\mathrm{c}\right)<mspace\; width="1em"></mspace>{\mathrm{O}}_2$

$\left(\mathrm{d}\right)<mspace\; width="1em"></mspace>{\mathrm{H}}_2$

Which of the following statements is true? 

Which of the following on heating produces ${\mathrm{NO}}_2$?

(a) ${\mathrm{NaNO}}_3$                               (b) ${\mathrm{AgNO}}_3$

(c) ${\mathrm{NH}}_4{\mathrm{NO}}_3$                              (d) ${\mathrm{NH}}_4{\mathrm{NO}}_2$

$\mathrm{A}+{\mathrm{H}}_2\mathrm{O}\stackrel{}{\to }\mathrm{B}+\mathrm{HCl}$
$\mathrm{B}+{\mathrm{H}}_2\mathrm{O}\stackrel{}{\to }\mathrm{C}+\mathrm{HCl}$

Compound (A),(B) and (C) will be respectively :

(a) ${\mathrm{PCl}}_5,<mspace\; width="1em"></mspace>{\mathrm{POCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{H}}_3{\mathrm{PO}}_3$                 (b) ${\mathrm{PCl}}_5,<mspace\; width="1em"></mspace>{\mathrm{POCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{H}}_3{\mathrm{PO}}_4$

(c) ${\mathrm{SOCl}}_2,<mspace\; width="1em"></mspace>{\mathrm{POCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{H}}_3{\mathrm{PO}}_3$               (d) ${\mathrm{PCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{POCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{H}}_3{\mathrm{PO}}_4$

Which of the following is in the correct sequence?

[For the correct order mark (T) and for the incorrect order mark (F)]:

Incorrect statement regarding PH₃ is:

1. It is produced by the hydrolysis of Ca₃P₂${\mathrm{}}_{}$

2. It gives a black ppt, Cu₃P₂ with a CuSO₄ solution.

3. It spontaneously burns in the presence of ${\mathrm{P}}_2{\mathrm{H}}_4$

4. It does not react with ${\mathrm{B}}_2{\mathrm{H}}_6$

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) ${\mathrm{PCl}}_5$

The false statement regarding hydrides from the 15th group is:

A non-metal M forms ${\mathrm{MCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{M}}_2{\mathrm{O}}_5<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{Mg}}_3{\mathrm{M}}_2$ but does not form ${\mathrm{MI}}_5$. Then incorrect statement regarding non-metal M is:

(a) M can form multiple bond

(b) M is of second period element 

(c) Atomicity of non-metal is 4

(d) The range of oxidation number for M is +5 to -3

The correct order of $\mathrm{S}—\mathrm{S}$ bond length in the following oxyanion is :

(I) ${\mathrm{S}}_2{\mathrm{O}}_4^{2-}$                  (II) ${\mathrm{S}}_2{\mathrm{O}}_5^{2-}$                      (III) ${\mathrm{S}}_2{\mathrm{O}}_6^{2-}$

(a) I$>$II$>$III                                      (b) I$>$III$>$II

(c) III$>$II$>$I                                       (d) III$>$I$>$II