P-block elements practice · Mixed difficulty

Given below are two statements:
Statement I : The boiling points of the following hydrides of group 16 elements increases in the order
${H_2}O < {H_2}S < {H_2}Se < {H_2}Te$
Statement II : The boiling points of these hydrides increase with increase in molar mass.
In the light of the above statements, choose the most appropriate answer from the options given below:

Assertion (A): Deep sea divers use helium & oxygen mixture for respiration.

Reason (R): Helium is inert in nature.

When the mineral clevite is heated, it give off the inert gas

Most acidic oxide among the following is

Which of the following compounds gives chlorine dioxide when it reacts with $S{O_2}$ in the presence of acid?

Sea-weeds are important sources of:

HI cannot be prepared by heating KI with conc.${H_2}S{O_4}$ because:

The compound used as refrigerant is:

${MF}+{XeF}_4 \rightarrow {A}^{\prime}\left({M}^{+}=\right.$Alkalimetalcation $)$
The state of hybridisation of the central atom in '$A$' and shape of the species are:

Which of the following solutions does not change its colour on passing ozone through it?

Assertion (A) : The reaction $\mathrm{XeO}_3+6 \mathrm{H}^{+}+6 e^{-} \rightleftharpoons \mathrm{Xe}+3 \mathrm{H}_2 \mathrm{O}, E^{\circ}=2.1 \mathrm{~V}$ is not feasible thermodynamically to oxidise $\mathrm{H}_2 \mathrm{O}$

Reason (R) : There is a high activation energy barrier between oxidation state +6 and 0 of $\mathrm{Xe}$.

Phosphine on reaction with hydrobromic acid gives:

Which of the following cannot as an oxidising agent?

Which element is not considered as ‘chalcogens’?

When one mole of bleaching powder is completely decomposed in presence of $\mathrm{C}{\mathrm{O}_2}$ then the mass of chlorine gas that is liberated will be:

Oxide of nitrogen which has smallest ' $\mathrm{N}-\mathrm{O}$ ' bond length among the following is

$Xe{O_2}{F_2}$ is obtained by partial bydrolysis of

$98\% \;\,{H_2}S{O_4}\;$ is:

Iodide of Millon's base is :

When copper is heated with conc. $\mathrm{HN}{\mathrm{O}_3}$ it produces:

Non-combustible hydride is:

The substance used in Holme’s signal of the ship is a mixture of

Which of the light effective in the formation of chlorophyll?

Which among the following is least covalent in nature?

Beilstein test is used for the detection of :

Fertilizer having the highest nitrogen percentage is:

In qualitative analysis, when $\mathrm{H}_2 \mathrm{~S}$ is passed through an aqueous solution of salt acidified with dil. $\mathrm{HCl}$, a black precipitate is obtained. On boiling the precipitate with dil. $\mathrm{HNO}_3$, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives ......... .

Formula of calcium chlorite is:

Statement-I: ${F}_2$ is better oxidising agent than ${Cl}_2$
Statement-II: $HI$ is strongest acid and strongest reducing agent among hydrides of VIIA

Red $\mathrm{P}$ can be obtained by white $\mathrm{P}$ by