P-block elements practice · Medium

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

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

The compound that attacks pyrex glass is:

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.

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

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:

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

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

Oxygen can be obtained from bleaching powder by:

The reaction of $NO$ with ${N_2}{O_4}$ at 250 K gives

S-I: ${H}_2{O}$ is most volatile and ${H}_2 {S}$ is least volatile hydrides of group 16 elements.

S-II: ${H}_2{O}$ has the highest and ${H}_2 {S}$ has the lowest boiling point.

S-I: ${XeF}_2$ react with ${PF}_5$ gives $\left[{XeF}^{+}\right]\left[{PF}_6\right]^{-}$.

S-II: ${He}$ is used to produce NMR spectrometers and MRI systems for clinical diagnosis.

Boiling of dil. $HCl$ acid does not increase its concentration beyond 20.24 per cent because hydrochloric acid:

Assertion (A): ${PCl}_5(\mathrm{s})$ is an example of molecular solid.

Reason (R): ${PCl}_5(\mathrm{s})$ exist as $\left({PCl}_4\right)^{+}\left({PCl}_6\right)^{-}$

Which is not the disproportionation reaction?

Which statement is wrong?

Which of the following reactions will not produce chlorine gas?

What is ${X}$ and ${Y}$ in the given reactions ?

$\begin{aligned} & 2 {X}_2(g)+2 {H}_2 {O}(l) \rightarrow 4 {H}^{+}(a q)+4 {X}^{-}(a q)+{O}_2(g) \\ & {Y}_2(g)+{H}_2 {O}(l) \rightarrow {HY}(a q)+{HOY}(a q) \end{aligned}$

A certain compound when burnt gave three oxides. The first turned lime water milky, the second turned cobalt chloride paper pink and the third formed an aqueous solution of pH 3 nearly. The elements present in the compound are:

Find $A,\,\,B$ and $C$ in the following reactions:
$\begin{array}{l} N{H_3}\, + \,A\, + \,C{O_2} \to {(N{H_4})_2}C{O_3}\\ {(N{H_4})_2}C{O_3}\, + \,{H_2}O\, + \,B \to N{H_4}HC{O_3}\\ N{H_4}HC{O_3}\, + \,NaCl \to N{H_4}CI\, + \,C \end{array}$

Phosphorous forms two chlorides which have different compositions. The oxidation number of which element remains constant?

Consider the following statements for lead storage battery.

a. It consists of a grid of lead packed with $\mathrm{PbO}_2$ as anode and a lead cathode

b. $38 \%$ solution of $\mathrm{H}_2 \mathrm{SO}_4$ is used as an electrolyte

c. It is commonly used in automobiles and invertors

Which of the above statements are correct?

Statement I: Triple phosphate is more soluble in water than super phosphate of lime

Statement II: The $\mathrm{CaSO}_4$ in super phosphate of lime is an insoluble waste product and no value to the plants

${S}^{2-}$ and ${SO}_3{ }^{2-}$ can be distinguished by using

Starch paper moistened with $\mathrm{KI}$ solution turns blue in ozone because of:

Dipole moment of the hydrides of group 15 elements decreases in the order -

Bromine is obtained on a commercial scale from: