P-block elements practice · Mixed difficulty

Which are hydrolysed by water?

Nitric acid may be kept in a bottle of:

Iron is dropped in dil $HN{O_3}$ it gives

Which of the silver salts are soluble in water?

Which of the following is used to provide smoke screens :

The most abundant inert gas in air is:

Assertion : Dinegative anion of oxygen $\left({O}^{2-}\right)$ is quite common but dinegative anion of sulphur $\left({S}^{2-}\right)$ is less common.

Reason : Covalency of oxygen is two.

The gaseous decomposition of ozone $2 \mathrm{O}_3 \rightarrow 3 \mathrm{O}_2$ follows the mechanism

$\mathrm{O}_3 \stackrel{\mathrm{k}_{\mathrm{eq}}}{\rightleftharpoons} \mathrm{O}_2+\mathrm{O} \text { (Fast), } \mathrm{O}+\mathrm{O}_3 \xrightarrow{\mathrm{k}_1} 2 \mathrm{O}_2 \text { (Slow) }$

Determine the order of reaction with respect to $\mathrm{O}_2$ :

The principal source of helium is:

A mixture of which pair of species react with water to produce a pure colourless gas that gives white fumes with $HCl$?

Assertion (A) : ${Cl}_2$ or ${Br}_2$ changes ${KI}$ into ${I}_2$ (violet in ${CCl}_4$ layer), ${Cl}_2$ changes ${KBr}$ into ${Br}_2$ (orange-yellow in ${CCl}_4$ layer). Thus, ${Cl}_2$ would change mixture of ${KI}$ and ${KBr}$ into violet layer in ${CCl}_4$.

Reason (R) : Oxidising power is in order ${I}_2 < {Br}_2 < {Cl}_2 < {F}_2$.

Assertion (A): Conc. Sulphuric acid can be used to prepare $HCl$ on reaction with $NaCl.$

Reason (R): Conc. $\mathrm{H}_2 \mathrm{SO}_4$ is a moderately strong reducing agent.

In which reaction does $S{O_2}$ act as oxidizing agent?

Liquor ammonia is

Which element shows polymorphism?

Which of the following pairs is obtained on heating ammonium dichromate?

Phosphine is not collected in air because:

The noble gas forming maximum number of compound is

On reaction with water,

I. fluorine oxidises water to oxygen.

II. chlorine and bromine react with water to form corresponding hydrohalic and hypohalous acids.

III. reaction of iodine with water is spontaneous.

Which of the above mentioned statements is/are correct?

Read the following statements regarding chemical reactivity of group 15 elements.

(i) Only compound of ${Bi}$ with +5 oxidation state is ${BiF}_5$.

(ii) Intermediate oxidation states for both nitrogen and phosphorus disproportionate in both acid and alkali.

(iii) Nitrogen due to absence of d-orbitals in its valence shell cannot form ${d} \pi$-p $\pi$ bond as the heavier elements thus ${R}_3 {P}={O}$ exists but ${R}_3 {~N}={O}$ does not exists.

(iv) ${BiH}_3$ is the strongest reducing agent amongst the hydrides of nitrogen family.

(v) ${P}_2 {O}_3$ is more acidic than ${P}_2 {O}_5$.

Which of the following is the correct code for the statements above?

$N{H_3}\;$ gas is dried over:

The reaction in the Kipp’s apparatus stops on closing the outlet, because:

The hydride of group 16 elements showing maximum tendency for complex formation is

S-I: $O g$ has been synthetically produced by collision of ${ }_{98}^{249} {Cf}$ atoms ${ }_{20}^{48} {Ca}$ ions.

S-II: Its $({Og})$ half life period is $7 \, \mathrm{sec}$.

Statement-I: ${P}_2 {O}_3$ is more basic than ${N}_2 {O}_3$

Statement-II: Metallic nature of the central atom increases down the group

The gas which is absorbed by ferrous sulphate solution giving blackish brown colour is:

A person working with phosphorus suffers from a disease in which bones decay. It is known as

The acidity of hydrides of O, S, Se, Te varies in the order

In which of the following reactions chlorine is both reduced and oxidized?

Nitrogen forms …. Oxides.