${\mathrm{XeF}}_6$ 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

Which of the following statements about helium is false?

1. It has the lowest boiling point 

2. It has the highest first ionization energy

3. It can diffuse through rubber and plastic material

4. It can form clathrate compounds

Which of the following is an uncommon hydrolysis product of ${\mathrm{XeF}}_2 \mathrm{and} {\mathrm{XeF}}_4$?

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

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

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

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

${\mathrm{SbF}}_5$ reacts with ${\mathrm{XeF}}_4$ to form an adduct. The shapes of cation and anion in the adduct are respectively:

(1) square planar, trigonal bipyramidal       

(2) T-shaped, Octahedral

(3) square pyramidal, octahedral                 

(4) square planar, octahedral

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?

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

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

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

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

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 :

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

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

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

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

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

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.