When chlorine water is exposed to sunlight, ${{\rm{O}}_2}$ is liberated. Hence:

Hydrogen has little affinity to ${{\rm{O}}_2}$

Hydrogen has more affinity to ${{\rm{O}}_2}$

Gases under ordinary conditions

${\rm{N}}{{\rm{H}}_3}$ can be collected by the displacement of:

Conc. ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$

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JEE • CHEMISTRY • P-BLOCK ELEMENTS

P-block elements practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 211-240 of 344 questions

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211 Easy

211 of 344

Remembering +4 | -1

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

View answer and explanation

Correct option: B

Phossay jaw

Option B (Phossay jaw) is correct because it is a disease caused by exposure to phosphorus, leading to bone decay in the jaw.

212 Easy

212 of 344

Understanding +4 | -1

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

View answer and explanation

Correct option: B

{H_2}O < {H_2}S < {H_2}Se < {H_2}Te

Option B (

{H_2}O < {H_2}S < {H_2}Se < {H_2}Te

) is correct because the acidity of hydrides increases down the group due to decreasing bond strength.

213 Easy

213 of 344

Analyzing +4 | -1

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

View answer and explanation

Correct option: B

6 {NaOH}+3 {Cl}_2 \longrightarrow 5 {NaCl}+{NaClO}_3+3 {H}_2 {O}

Option B (

6 {NaOH}+3 {Cl}_2 \longrightarrow 5 {NaCl}+{NaClO}_3+3 {H}_2 {O}

) is correct because chlorine undergoes both oxidation (to

NaClO_3

) and reduction (to

NaCl

) in the same reaction.

214 Easy

214 of 344

Remembering +4 | -1

Nitrogen forms …. Oxides.

View answer and explanation

Correct option: C

Option C (5) is correct because Nitrogen forms five stable oxides:

N_2O

NO

N_2O_3

N_2O_4

, and

N_2O_5

215 Easy

215 of 344

Remembering +4 | -1

The catalyst used in the manufacture of

{H_2}S{O_4}

by contact process is

View answer and explanation

Correct option: B

{V_2}{O_5}

Option B (

{V_2}{O_5}

) is correct because vanadium(V) oxide is the most commonly used catalyst in the contact process for sulfuric acid production.

216 Easy

216 of 344

Remembering +4 | -1

Bromargyrite is a mineral of:

View answer and explanation

Correct option: D

B{r_2}

Option D (

B{r_2}

) is correct because Bromargyrite is a mineral of bromine.

217 Easy

217 of 344

Understanding +4 | -1

PC{l_3}

on hydrolysis gives

View answer and explanation

Correct option: D

{H_3}P{O_3}

Option B (0) is correct because Sc3+ has no unpaired electrons, resulting in a zero magnetic moment.

218 Easy

218 of 344

Application +4 | -1

Which has the same electronic configuration as of inert gas?

View answer and explanation

Correct option: D

T{i^{4 + }}

Option D (

Ti^{4+}

) is correct because it has the same electronic configuration as Argon, an inert gas.

219 Easy

219 of 344

Understanding +4 | -1

When ammonium nitrate is heated at

{250^ \circ }C

the gas evolved is

View answer and explanation

Correct option: D

{\mathrm{N}_\mathrm{2}}\mathrm{O}

Option D is correct because ammonium nitrate decomposes upon heating at 250°C to produce nitrous oxide (N2O) and water.

220 Easy

220 of 344

Remembering +4 | -1

Which noble gas is not found in atmosphere?

View answer and explanation

Correct option: A

\mathrm{Rn}

Option A (

\mathrm{Rn}

) is correct because Radon (Rn) is a radioactive noble gas that is not typically found in the atmosphere due to its origin from radioactive decay.

221 Easy

221 of 344

Understanding +4 | -1

The number of sigma bonds in

{P_4}{O_{10}}

is:

View answer and explanation

Correct option: B

Option B (16) is correct because the structure of

P_4O_{10}

contains 16 sigma bonds.

222 Easy

222 of 344

Remembering +4 | -1

Which element is extracted commercially by the electrolysis of an aqueous solutions of one of its compounds?

View answer and explanation

Correct option: C

Chlorine

Option C (Chlorine) is correct because chlorine is commercially extracted by the electrolysis of an aqueous solution of sodium chloride (brine).

223 Easy

223 of 344

Understanding +4 | -1

Which statement is not correct?

View answer and explanation

Correct option: D

The most abundant rare gas found in atmosphere is

He

Option D is correct because Argon (Ar) is the most abundant rare gas in the atmosphere, not Helium (He).

224 Easy

224 of 344

Understanding +4 | -1

\begin{aligned} & \mathrm{Cu}+\underset{\text { (dil) }}{\mathrm{HNO}_3} \rightarrow \mathrm{a}+\mathrm{Cu}\left(\mathrm{NO}_3\right)_2+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{Zn}+\underset{\text { (dil) }}{\mathrm{HNO}_3} \rightarrow \mathrm{b}+\mathrm{Zn}\left(\mathrm{NO}_3\right)_2+\mathrm{H}_2 \mathrm{O} \end{aligned}

Here a and b are:

View answer and explanation

Correct option: B

\mathrm{NO}, \mathrm{N}_2 \mathrm{O}

Option B is correct because copper reacts with dilute nitric acid to produce nitric oxide (NO), while zinc reacts with dilute nitric acid to produce nitrous oxide (

N_2O

225 Easy

225 of 344

Understanding +4 | -1

When chlorine water is exposed to sunlight,

{\mathrm{O}_2}

is liberated. Hence:

View answer and explanation

Correct option: C

Hydrogen has more affinity to chlorine

Option C (Hydrogen has more affinity to chlorine) is correct because chlorine reacts with water to form hydrochloric acid and oxygen, indicating hydrogen's preference for chlorine.

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226 Easy

226 of 344

Understanding +4 | -1

Which forms new compound in air?

View answer and explanation

Correct option: D

Phosphorus in air

Option D (Phosphorus in air) is correct because phosphorus reacts with oxygen in the air to form phosphorus oxides, which are new compounds.

227 Easy

227 of 344

Remembering +4 | -1

Hyponitrous acid is:

View answer and explanation

Correct option: C

{H_2}{N_2}{O_2}

Option C (

{H_2}{N_2}{O_2}

) is correct because this is the chemical formula for hyponitrous acid.

228 Easy

228 of 344

Remembering +4 | -1

The word argon means:

View answer and explanation

Correct option: D

Lazy

The correct answer is D (Lazy) because the word \"argon\" is derived from the Greek word \"argos,\" which means lazy or inactive.

229 Easy

229 of 344

Remembering +4 | -1

S{O_2}

reacts with

C{l_2}

to yield:

View answer and explanation

Correct option: C

Sulphuryl chloride

Option C (Sulphuryl chloride) is correct because the reaction of

S{O_2}

with

C{l_2}

produces

S{O_2}C{l_2}

, which is sulphuryl chloride.

230 Easy

230 of 344

Remembering +4 | -1

Halogens are:

View answer and explanation

Correct option: B

Electronegative in nature

Option B (Electronegative in nature) is the correct answer because halogens are highly electronegative non-metals.

231 Easy

231 of 344

Remembering +4 | -1

The product obtained as a result of a reaction of nitrogen with

Ca{C_2}\,

is:

View answer and explanation

Correct option: A

\mathrm{Ca(CN}{\mathrm{)}_\mathrm{2}}

The correct answer is A (

\mathrm{Ca(CN}{\mathrm{)}_\mathrm{2}}

) because calcium carbide reacts with nitrogen gas to form calcium cyanamide, which is represented as

\mathrm{Ca(CN}{\mathrm{)}_\mathrm{2}}

232 Easy

232 of 344

Remembering +4 | -1

Which one of the following noble gases is not found in the atmosphere

View answer and explanation

Correct option: A

{Rn}

Option A (

{Rn}

) is correct because Radon is a radioactive element produced by the decay of radium and is not typically found in the atmosphere in significant amounts.

233 Easy

233 of 344

Understanding +4 | -1

\mathrm{N}{\mathrm{H}_3}

can be collected by the displacement of:

View answer and explanation

Correct option: A

Mercury

Option A (Mercury) is correct because ammonia does not react with mercury, allowing it to be collected by displacement.

234 Easy

234 of 344

Analyzing +4 | -1

Assertion:

\mathrm{SF}_6

is a very inert molecule.

Reason: It is difficult to break the

S-F

bonds.

View answer and explanation

Correct option: C

Assertion is correct, but reason is wrong statement.

Option C is correct because SF6 is inert due to steric reasons and kinetic stability, not because S-F bonds are difficult to break.

235 Easy

235 of 344

Remembering +4 | -1

One element of group-16 shows anomalous behaviour. Identify this element.

View answer and explanation

Correct option: C

Oxygen

Option C (Oxygen) is correct because oxygen exhibits anomalous behavior in group 16 due to its small size and high electronegativity.

236 Easy

236 of 344

Remembering +4 | -1

Sulphuric acid is used:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because sulfuric acid is used in lead storage batteries, as a dehydrating agent, and in making fertilizers.

237 Easy

237 of 344

Remembering +4 | -1

In the known interhalogen compounds the maximum number of halogen atoms is:

View answer and explanation

Correct option: D

Option C (7) is incorrect. Option D (8) is correct because interhalogen compounds like

IF_7

can have a total of 8 halogen atoms (1 Iodine and 7 Fluorine).

238 Easy

238 of 344

Remembering +4 | -1

{F_2}

is largely used in:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because fluorine is used in making Freon, Teflon, and rocket fuels.

239 Easy

239 of 344

Understanding +4 | -1

Which of the following is anhydride of perchloric acid?

View answer and explanation

Correct option: A

C{l_2}{O_7}

Option A is correct because when perchloric acid (

{HCIO_4}

) undergoes dehydration, it forms its anhydride, which is chlorine heptaoxide (

{Cl_2O_7}

240 Easy

240 of 344

Understanding +4 | -1

Among the fluorides below, the one which does not exist is

View answer and explanation

Correct option: B

\mathrm{He}{\mathrm{F}_4}

Option B (

\mathrm{He}{\mathrm{F}_4}

) is correct because Helium is an inert gas and does not form stable compounds like

\mathrm{He}{\mathrm{F}_4}

Revision notes and key takeaways

Review P-BLOCK ELEMENTS in your textbook or class notes, then use this set to check your understanding.

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