Correct order of bond angle in given species is :

$\left(\mathrm{a}\right) {\mathrm{SiO}}_4^{4-}>{\mathrm{PCl}}_3>{\mathrm{NCl}}_3>{\mathrm{SbH}}_3>{\mathrm{H}}_2\mathrm{Te}$

$\left(\mathrm{b}\right) {\mathrm{SiO}}_4^{4-}>{\mathrm{NCl}}_3>{\mathrm{PCl}}_3>{\mathrm{SbH}}_3>{\mathrm{H}}_2\mathrm{Te}$

$\left(\mathrm{c}\right) {\mathrm{SiO}}_4^{4-}>{\mathrm{H}}_2\mathrm{Te}>{\mathrm{SbH}}_3>{\mathrm{PCl}}_3>{\mathrm{NCl}}_3$

$\left(\mathrm{d}\right) {\mathrm{NCl}}_3>{\mathrm{PCl}}_3> {\mathrm{SiO}}_4^{4-}>{\mathrm{SbH}}_3>{\mathrm{H}}_2\mathrm{Te}$

The incorrect order is:

$\left(\mathrm{a}\right) \mathrm{N}>\mathrm{P}>\mathrm{As}\mathbf{ }\mathbf{:} \mathrm{Strength} \mathrm{of} \mathrm{\pi }‐\mathrm{bond} \mathrm{with} \mathrm{oxygen} \mathrm{atom}$

$\left(\mathrm{b}\right) {\mathrm{SiF}}_4>{\mathrm{SiCl}}_4>{\mathrm{SiBr}}_4>{\mathrm{Sil}}_4 \mathbf{:}\mathbf{ }\mathrm{Thermal} \mathrm{stability}$

$\left(\mathrm{c}\right) {\mathrm{H}}_2\mathrm{S}>{\mathrm{H}}_2\mathrm{Se}>{\mathrm{H}}_2\mathrm{Te} \mathbf{:}\mathbf{ }\mathrm{Arrhenious} \mathrm{acid} \mathrm{character}$

$\left(\mathrm{d}\right) {\mathrm{CaBr}}_2>{\mathrm{MgBr}}_2>{\mathrm{BeBr}}_2 \mathbf{:}\mathbf{ }\mathrm{Melting} \mathrm{point}$

Among the following cyclic species are :

$\left(\mathrm{I}\right) {\mathrm{H}}_5{\mathrm{P}}_3{\mathrm{O}}_{10} \left(\mathrm{II}\right) {\left[{\mathrm{B}}_3{\mathrm{O}}_3{\left(\mathrm{OH}\right)}_5\right]}^{2-} \left(\mathrm{III}\right) {\mathrm{H}}_5{\mathrm{P}}_5{\mathrm{O}}_{15} \left(\mathrm{IV}\right) {\mathrm{P}}_3{\mathrm{N}}_3{\mathrm{Cl}}_6$

$\left(\mathrm{a}\right) \mathrm{I}, \mathrm{III}$

$\left(\mathrm{b}\right) \mathrm{I}, \mathrm{III}, \mathrm{IV}$

$\left(\mathrm{c}\right) \mathrm{II}, \mathrm{III}, \mathrm{IV}$

$\left(\mathrm{d}\right) \mathrm{I}, \mathrm{II}, \mathrm{III}, \mathrm{IV}$

$HCN+H_{2}O\to \left[X\right]+N{H}_3$

$\left[X\right]\stackrel{∆}{\to }\left[Y\right]+H_{2}O$

(Unbalanced equations)

[Y] May be prepared by which one of the following methods?

[A] By dehydration of malonic acid with $P_2{O}_5$

[B] By thermal decomposition of carbon sub-oxide in air.

[C] By heating potassium hyxacyaanoferrate (II) with conic $H_{2}S{O}_4$

[D] By the action of conc. $HN{O}_3$ on charcoal  

Select the correct statement about elements of group ${15}^{th}$.

(A) The order of stability of oxidation state for +3 is $B{i}^{3+}>S{b}^{3+}>A{s}^{3+}$ and for +5 is $B{i}^{5+}<S{b}^{5+}<A{s}^{5+}$

(B) In the case of nitrogen, all oxidation states from +1 to +4 tend to disproportionate in acid solution.

(C) There is considerable increase in covalent radius from N to P but from As to Bi only a small increase in covalent radius is observed.

(D) All of these.

Which of the following compounds does not give nitrogen on heating?

(1) $Na{N}_3$                                                     

(2) ${\left(N{H}_4\right)}_{2}S{O}_4$

(3) $N{H}_{4}N{O}_2$                                               

(4) $\left(N{H}_4\right)2C{r}_2{O}_7$

A brown-coloured mixture of two gases is obtained by reducing 6 N nitric acid with metallic copper. This mixture on cooling condenses to a blue liquid which on freezing (-30 ^oC) gives a blue solid. The correct statement for the blue liquid or solid is: 

Which of the following statements is false?  

$N{H}_{4}Cl{O}_4+HN{O}_3\left(dilute\right)\to HCl{O}_4+\left[X\right]$

$\left[X\right]\stackrel{∆}{\to }Y\left(g\right)$

$\left[X\right]$ and $\left[Y\right]$ are respectively.

(a) $N{H}_{4}N{O}_3 and N_{2}O$       (c) $N{H}_{4}N{O}_2 and N_2$

(b) $HN{O}_4 and O_2$                (d) None

One of the products of the following reaction $KCNO+{\left(NH\right)}_{4}S{O}_4$ is :

(A) $N{H}_{4}N{O}_2$                              (B) $N{H}_{4}N{O}_3$

(C) $N{H}_2-CO-N{H}_2$                  (D) $N_2$ and $N{O}_2$ both