In radiotherapy for treatment of cancer

${\rm{NC}}{{\rm{l}}_3}$ on hydrolysis yields:

${\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{\;and}}\,{\rm{ HOCl}}$

${{\rm{N}}_{\rm{2}}}{\mkern 1mu} {\mkern 1mu} \,{\rm{and}}\,\,{\rm{NOCl}}$

${{\rm{N}}_2}{\rm{O}}\,\,\,{\rm{and}}\,\,{\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{\;}}\;$

A solution of $N{H_3}$ in alcohol

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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 181-210 of 344 questions

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181 Easy

181 of 344

Remembering +4 | -1

Which element reacts with chlorine to give pentachloride?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because P, As, and Sb can all react with chlorine to form pentachlorides.

182 Easy

182 of 344

Analyzing +4 | -1

For the reaction

{X}_2+2 {Y}^{-} \rightarrow {Y}_2+2 {X}^{-}, {X}

and

{Y}

may not be

View answer and explanation

Correct option: D

{X}={Br}

then

{Y}={F}, {Cl}

Option D (If

{X}={Br}

then

{Y}={F}, {Cl}

) is correct because bromine is a weaker oxidizing agent than fluorine and chlorine, so it cannot oxidize their ions.

183 Easy

183 of 344

Application +4 | -1

Normality of pure sulphuric acid is:

View answer and explanation

Correct option: D

36 N

Option D (36 N) is correct because the normality of pure sulfuric acid is approximately 36 N.

184 Easy

184 of 344

Understanding +4 | -1

Which gas cannot be collected over water ?

View answer and explanation

Correct option: D

{SO}_2

Option D (

{SO}_2

) is correct because sulfur dioxide is highly soluble in water, reacting to form sulfurous acid, and thus cannot be collected over water.

185 Easy

185 of 344

Understanding +4 | -1

Which element does not form stable diatomic molecules?

View answer and explanation

Correct option: B

Phosphorus

Option B (Phosphorus) is correct because phosphorus exists as a tetra-atomic molecule (

P_4

) rather than a stable diatomic molecule like iodine, nitrogen, and oxygen.

186 Easy

186 of 344

Remembering +4 | -1

Which of the following is used in very low temperature thermometers?

View answer and explanation

Correct option: A

Option A (He) is correct because Helium is used in very low temperature thermometers due to its extremely low boiling point.

187 Easy

187 of 344

Remembering +4 | -1

Interhalogen compounds are:

View answer and explanation

Correct option: D

Covalent compounds

Option D (Covalent compounds) is correct because interhalogen compounds are formed by covalent bonding due to relatively small electronegativity differences between the halogens.

188 Easy

188 of 344

Remembering +4 | -1

Argon is used

View answer and explanation

Correct option: C

In high temperature welding

Option C (In high temperature welding) is correct because argon is an inert gas and is used to provide a non-oxidizing atmosphere in high-temperature welding to prevent oxidation of the metals.

189 Easy

189 of 344

Analyzing +4 | -1

Minimum bond length will be in:

View answer and explanation

Correct option: B

Option B (HF) is correct because fluorine has the smallest atomic size among the given options, leading to the shortest bond length when bonded with hydrogen.

190 Easy

190 of 344

Remembering +4 | -1

Atomicity of phosphorus is:

View answer and explanation

Correct option: D

Option D (4) is correct because phosphorus exists as a tetra-atomic molecule,

P_4

191 Easy

191 of 344

Remembering +4 | -1

Which oxide of N is neutral?

View answer and explanation

Correct option: D

{N_2}O

Option D (

{N_2}O

) is correct because

{N_2}O

(nitrous oxide) is a neutral oxide of nitrogen.

192 Easy

192 of 344

Analyzing +4 | -1

In which of the following reaction, oxidation number of

{N}

does not change

View answer and explanation

Correct option: C

2 {NO}_2 \rightarrow {N}_2 {O}_4

Option C is correct. In the reaction 2NO2 -> N2O4, the oxidation number of N does not change. It remains +4 on both sides of the equation.

193 Easy

193 of 344

Analyzing +4 | -1

Of the following, which has three electron bond in its structure?

View answer and explanation

Correct option: B

Nitric oxide

Option B (Nitric oxide) is correct because nitric oxide (NO) has an odd number of electrons, resulting in a three-electron bond in its Lewis structure.

194 Easy

194 of 344

Understanding +4 | -1

The following statements concern elements in the
periodic table. Which of the following is true?

View answer and explanation

Correct option: C

Elements of Group 16 have lower ionization
enthalpy values compared to those of Group
15 in the corresponding periods

Option C is correct because Group 16 elements have lower ionization enthalpy than Group 15 elements due to the extra stability of the half-filled p-orbitals in Group 15.

195 Easy

195 of 344

Remembering +4 | -1

Which inert gas has the highest boiling point?

View answer and explanation

Correct option: A

\mathrm{Xe}

Option A (Xe) is correct because the boiling point of noble gases increases with increasing atomic mass due to stronger London dispersion forces, and Xenon (Xe) has the highest atomic mass among the options.

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196 Easy

196 of 344

Understanding +4 | -1

\mathrm{NC}{\mathrm{l}_3}

on hydrolysis yields:

View answer and explanation

Correct option: C

\mathrm{N}{\mathrm{H}_\mathrm{3}}\mathrm{\;and}\,\mathrm{ HOCl}

Option C (

\mathrm{N}{\mathrm{H}_\mathrm{3}}\mathrm{\;and}\,\mathrm{ HOCl}

) is correct because the hydrolysis of NCl3 results in the formation of ammonia and hypochlorous acid.

197 Easy

197 of 344

Remembering +4 | -1

{P_2}{O_5}

is used extensively as a:

View answer and explanation

Correct option: A

Dehydrating agent

Option A (Dehydrating agent) is correct because

{P_2}{O_5}

has a strong affinity for water and is widely used to remove water from other substances.

198 Easy

198 of 344

Remembering +4 | -1

Ozonization of water is carried out to remove:

View answer and explanation

Correct option: A

Bacterial impurities

Option A (Bacterial impurities) is correct because ozonization is a water treatment process that effectively disinfects water by killing bacteria and viruses.

199 Easy

199 of 344

Understanding +4 | -1

Which are hydrolysed by water?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because

XeF_2

XeF_4

, and

XeF_6

all react with water to form various products including

HF

XeO_3

and

XeO_6^{4-}

200 Easy

200 of 344

Remembering +4 | -1

Nitric acid may be kept in a bottle of:

View answer and explanation

Correct option: D

Al

Option D (

Al

) is correct because aluminum forms a passive layer of aluminum oxide (

Al_2O_3

) which protects it from further reaction with nitric acid.

201 Easy

201 of 344

Understanding +4 | -1

Iron is dropped in dil

HN{O_3}

it gives

View answer and explanation

Correct option: C

Ferrous nitrate and ammonium nitrate

The correct answer is C (Ferrous nitrate and ammonium nitrate) because dilute nitric acid reacts with iron to produce ferrous nitrate and ammonium nitrate.

202 Easy

202 of 344

Remembering +4 | -1

The most abundant inert gas in air is:

View answer and explanation

Correct option: C

Option C (Ar) is correct because Argon constitutes approximately 1% of the Earth's atmosphere, making it the most abundant inert gas in air.

203 Easy

203 of 344

Remembering +4 | -1

The principal source of helium is:

View answer and explanation

Correct option: B

Monazite sand

Option B (Monazite sand) is correct because monazite sand is a significant source of helium, as it contains radioactive elements that decay to produce helium.

204 Easy

204 of 344

Analyzing +4 | -1

In which reaction does

S{O_2}

act as oxidizing agent?

View answer and explanation

Correct option: D

{H_2}S

The correct answer is D (

{H_2}S

) because in this reaction,

SO_2

oxidizes

{H_2}S

by accepting electrons, causing sulfur to be deposited.

205 Easy

205 of 344

Remembering +4 | -1

Liquor ammonia is

View answer and explanation

Correct option: C

Concentrated solution of

N{H_3}

in water

Option C (Concentrated solution of

N{H_3}

in water) is correct because liquor ammonia is a concentrated aqueous solution of ammonia.

206 Easy

206 of 344

Understanding +4 | -1

Which element shows polymorphism?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because Sulfur, Selenium, and Oxygen, all members of group 16, exhibit polymorphism.

207 Easy

207 of 344

Understanding +4 | -1

Phosphine is not collected in air because:

View answer and explanation

Correct option: C

It catches fire spontaneously in air

The correct answer is C (It catches fire spontaneously in air) because phosphine is highly reactive and ignites spontaneously in the presence of air due to the presence of P2H4 impurities.

208 Easy

208 of 344

Remembering +4 | -1

The noble gas forming maximum number of compound is

View answer and explanation

Correct option: A

Option A (Xe) is correct because Xenon has the lowest ionization energy among the stable noble gases, allowing it to form the most compounds.

209 Easy

209 of 344

Understanding +4 | -1

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

View answer and explanation

Correct option: B

{H_2}O

Option B is correct because water (

{H_2}O

) has the highest tendency for complex formation due to the small size and high electronegativity of oxygen, leading to a higher electron density and better donation ability.

210 Easy

210 of 344

Remembering +4 | -1

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}

View answer and explanation

Correct option: C

S-I is true, S-II is false

Option C (S-I is true, S-II is false) is correct because Oganesson (Og) was indeed synthesized by colliding Californium and Calcium ions, but its half-life is much shorter than 7 seconds.

Revision notes and key takeaways

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