P-block elements practice · Mixed difficulty

In Haber's process for the manufacture of ${NH}_3$ :

Which of the following elements is radioactive?

In which molecule hybrid orbital have only $20 \%$ d- character?

Which of the following is not a monobasic acid?

The number of molecules of water needed to convert one molecule of ${P_2}{O_{5\;}}$ into orthophosphoric acid is:

Which noble gas does not form clathrates?

When a mixture of $\mathrm{NaCl}$ and $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is gently warmed with conc. $\mathrm{H}_2 \mathrm{SO}_4$
(i) an orange-red vapour is evolved
(ii) the vapour formed when passed into $\mathrm{NaOH}$ solution gives yellow solution of $\mathrm{Na}_2 \mathrm{CrO}_4$
(iii) Chlorine gas is not evolved at all
(iv) chromyl chloride gas is formed
(v) $\mathrm{SnCl}_4$ used instead of $\mathrm{NaCl}$ also gives same observations

Berthelot’s salt is:

Which one is true peroxide?

Assertion (A): $\mathrm{Cl}_2$ on reaction with NaOH (Cold and dilute) gives $\mathrm{NaClO}_3.$

Reason (R): $\mathrm{Cl}_2$ get oxidized only in this reaction.

Which does not show allotropy

Which blue liquid is obtained on reacting equimolar amounts of two gases at $- {30^ \circ }C$ ?

Assertion (A) : On cooling, the brown colour of nitrogen dioxide disappears.

Reason (R): On cooling $\mathrm{NO}_2$ undergoes dimerisation resulting in the pairing of odd electrons of $\mathrm{NO}_2$.

The compound that attacks pyrex glass is:

The shape of $I{F_7}$ molecule is:

Helium gives a characteristic spectrum with:

Assertion (A) : Equivalent mass of $\mathrm{N}_2 \mathrm{H}_4$ is 8 in acidic medium or basic medium.

Reason (R) : It is oxidised to $\mathrm{N}_2$ with loss of four electron per $\mathrm{N}_2 \mathrm{H}_4$ unit.

Which of the following has no action with starch solution?

Assertion: Group 15 elements can exhibit multiple oxidation states.

Reason: Group 15 elements have five valence electrons that can be lost or gained to form ions with different charges.

In the ring test for $\mathrm{NO}_3^{-}$ion, a brown ring is formed due to the formation of

The following acids have been arranged in the order of decreasing acid strength. Identify the correct order
$\mathrm{ClOH}\left( \mathrm{I} \right)\mathrm{\;BrOH}\left( {\mathrm{II}} \right)\mathrm{\;IOH}\left( {\mathrm{III}} \right)$

A colourless gas with the smell of rotten fish is

Ammonia is used in detection of $\mathrm{Cu}^{2+}$ ion because

Statement I : CIF undergoes hydrolysis as below,
$CIF + {H_2}O \to HF + HOCl$
Statement II : Fluorine containing interhalogen compounds are very useful as fluorinating agents

$C{l_2}\;$ is used in the manufacture of:

Pnicogens are the elements of group?

Which of the following is the life saving mixture for an asthma patient?

How many lone pair of electrons are present on $Xe$ in $XeO{F_4}$ ?

The last orbit of argon would have electrons

Assertion (A): Ammonia cannot be dried over concentrated ${H}_2 {SO}_4$.

Reason (R): Conc. ${H}_2 {SO}_4$ reacts with ${NH}_3$.