${\left( {N{H_4}} \right)_2}S{O_4}$

${\left( {N{H_4}} \right)_3}P{O_4}$

Is an important constituent of rocket fuels

Is used for artificial respiration with $C{O_2}$

Mixed with finely divided carbon is explosive

${\rm{A}}{{\rm{s}}_2}{{\rm{O}}_3}$

${\rm{H}}{{\rm{g}}_2}{\rm{C}}{{\rm{l}}_2}$

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JEE • CHEMISTRY • P-BLOCK ELEMENTS

P-block elements practice · Mixed difficulty

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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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571 Easy

571 of 705

Understanding +4 | -1

Which of the following does not liberate

{N}_2

gas on heating?

View answer and explanation

Correct option: D

{NH}_4 {NO}_3

Option D (

{NH}_4 {NO}_3

) is correct because it decomposes to produce nitrous oxide (

{N}_2 {O}

) and water, not nitrogen gas.

572 Easy

572 of 705

Understanding +4 | -1

Assertion (A): Deep sea divers use

{He}-{O}_2

mixture for breathing.

Reason (R): Unlike

{N}_2

{He}

is insoluble in blood even under high pressure.

View answer and explanation

Correct option: C

(A) is true but (R) is false

Option A (Both (A) and (R) are true and (R) is the correct explanation of (A)) is correct because Helium is used to avoid nitrogen narcosis, which is caused by nitrogen dissolving in the blood at high pressures.

573 Medium

573 of 705

Analyzing +4 | -1

Consider the following statements

(i)

H_3{PO}_2

is called phosphinic acid
(ii) Pyrophosphorous acid contains two

P-H

bonds
(iii) Oxidation state of phosphorous in
hypophosphoric acid is +5
The correct statements are

View answer and explanation

Correct option: A

(i) and (ii) only

Option A ((i) and (ii) only) is correct because

H_3PO_2

is phosphinic acid and pyrophosphorous acid (

H_4P_2O_5

) contains two P-H bonds, while hypophosphoric acid (

H_4P_2O_6

) has an oxidation state of +4 for phosphorus.

574 Easy

574 of 705

Remembering +4 | -1

Sulphurous anhydride is:

View answer and explanation

Correct option: A

S{O_2}

Option A (

S{O_2}

) is correct because sulfurous anhydride is the chemical name for sulfur dioxide (

S{O_2}

575 Easy

575 of 705

Remembering +4 | -1

Which of the following is a metalloid?

View answer and explanation

Correct option: C

\mathrm{As}

Option C (As) is correct because Arsenic (As) is a metalloid, possessing properties of both metals and nonmetals.

576 Easy

576 of 705

Remembering +4 | -1

Smelling salt is:

View answer and explanation

Correct option: C

N{H_4}Cl

Option D (

{\left( {N{H_4}} \right)_2}C{O_3}

) is correct because ammonium carbonate decomposes to release ammonia gas, which has a pungent smell.

577 Easy

577 of 705

Understanding +4 | -1

P{H_3}

produces smoky rings when it comes in contact with air. This is because:

View answer and explanation

Correct option: D

It contains impurity of

\;{P_2}{H_4}

Option D (It contains impurity of

\;{P_2}{H_4}

) is correct because diphosphane (

P_2H_4

) is spontaneously flammable in air, causing the phosphine to ignite and produce smoky rings.

578 Easy

578 of 705

Understanding +4 | -1

In case of halogen family, which trend occurs as the atomic number increases?

View answer and explanation

Correct option: B

Ionization potential decreases

Option B (Ionization potential decreases) is correct because ionization potential generally decreases down a group as the atomic size increases and the outermost electrons are further from the nucleus.

579 Easy

579 of 705

Understanding +4 | -1

Which is not hydrolysed with water?

View answer and explanation

Correct option: B

N{F_3}

Option B (

N{F_3}

) is correct because

NF_3

is inert and does not readily hydrolyze due to the high electronegativity of fluorine and the absence of lone pairs on nitrogen to initiate hydrolysis.

580 Easy

580 of 705

Understanding +4 | -1

Assertion (A) : Fluorine has only -1 oxidation state in compounds.

Reason (R) : Fluorine has maximum electronegativity and electron-affinity.

View answer and explanation

Correct option: C

\mathbf{A}

is true but

\mathbf{R}

is false.

Option C (A is true but R is false) is correct because fluorine always exhibits a -1 oxidation state, but chlorine, not fluorine, has the highest electron affinity.

581 Easy

581 of 705

Remembering +4 | -1

Which of the following phosphorus is the most reactive?

View answer and explanation

Correct option: B

White phosphorus

Option B (White phosphorus) is correct because white phosphorus is the most reactive allotrope of phosphorus due to its tetrahedral structure and high angle strain.

582 Easy

582 of 705

Understanding +4 | -1

Assertion (A): Atomic size of

F

is smaller than that of

Cl .

Reason (R):

{F}-{F}

bond is stronger than

{Cl}- Cl

bond.

View answer and explanation

Correct option: C

(A) is true but (R) is false

Option C ((A) is true but (R) is false) is correct because fluorine is smaller than chlorine, but the F-F bond is weaker than the Cl-Cl bond due to interelectronic repulsions.

583 Easy

583 of 705

Remembering +4 | -1

The number of different oxides of chlorine is:

View answer and explanation

Correct option: D

Option D (6) is correct because chlorine forms six different oxides:

Cl_2O

ClO

ClO_2

Cl_2O_6

Cl_2O_7

, and

ClO_4

584 Easy

584 of 705

Remembering +4 | -1

Helium is used in balloons in place of hydrogen because it is

View answer and explanation

Correct option: A

Incobusible

Option A (Incombustible) is correct because helium is non-flammable (incombustible), making it safer than hydrogen for use in balloons.

585 Medium

585 of 705

Remembering +4 | -1

Liquid oxygen:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because liquid oxygen is used in rocket fuels, artificial respiration, and can be explosive when mixed with finely divided carbon.

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586 Medium

586 of 705

Understanding +4 | -1

When

S{O_2}

is passed through acidified solution of

{H_2}S

View answer and explanation

Correct option: C

Sulphur sol is formed

Option C is correct because when

SO_2

is passed through an acidified solution of

H_2S

, it oxidizes the

H_2S

to elemental sulfur, forming a sulfur sol.

587 Medium

587 of 705

Understanding +4 | -1

The compound which will boil at highest temperature is

View answer and explanation

Correct option: A

{HF}

Option A (

{HF}

) is correct because it forms intermolecular hydrogen bonds, leading to a higher boiling point compared to other hydrogen halides.

588 Easy

588 of 705

Understanding +4 | -1

Correct order of acidic strength of following is:

View answer and explanation

Correct option: B

\mathrm{HF} < \mathrm{HCl} < \mathrm{HBr} < \mathrm{HI}

Option B (

\mathrm{HF} < \mathrm{HCl} < \mathrm{HBr} < \mathrm{HI}

) is correct because the acidic strength of hydrogen halides increases down the group due to decreasing bond strength.

589 Easy

589 of 705

Remembering +4 | -1

The group 15 or VA group elements are commonly known as:

View answer and explanation

Correct option: C

Pnictogens

Option C (Pnictogens) is correct because the elements of Group 15 (VA) are collectively known as pnictogens.

590 Easy

590 of 705

Remembering +4 | -1

Which of the following halogen oxide is used for estimation of carbon monoxide in automobile exhaust gases?

View answer and explanation

Correct option: B

{I}_2 {O}_5

Option B (

{I}_2 {O}_5

) is correct because iodine pentoxide is used to quantitatively determine carbon monoxide by oxidizing it to carbon dioxide.

591 Medium

591 of 705

Analyzing +4 | -1

Which of the following statements is incorrect?

View answer and explanation

Correct option: B

{ClO}_2

is diamagnetic in nature

Option B is correct because ClO2 is paramagnetic due to having an odd number of electrons, making it not diamagnetic.

592 Easy

592 of 705

Understanding +4 | -1

Mixture of sand and iodine can be separated by:

View answer and explanation

Correct option: C

Sublimation

Option C is correct because iodine can be separated from sand by sublimation, as it readily converts to a gas upon heating, leaving the sand behind.

593 Easy

593 of 705

Analyzing +4 | -1

Which of the following shows disproportionation reaction:

View answer and explanation

Correct option: D

All

The correct answer is D (All) because

\mathrm{ClO}^{-}

\mathrm{ClO}_2^-

, and

\mathrm{ClO}_3^{-}

can all undergo disproportionation reactions.

594 Easy

594 of 705

Understanding +4 | -1

Ozone reacts with:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because ozone reacts with molecules containing C=C or C≡C bonds to form ozonides.

595 Easy

595 of 705

Application +4 | -1

The percentage of nitrogen in urea is about:

View answer and explanation

Correct option: C

Option C (47) is correct because the percentage of nitrogen in urea (NH2CONH2) is approximately 47%.

596 Medium

596 of 705

Remembering +4 | -1

Element with the lowest atomicity

View answer and explanation

Correct option: D

O

Option D (

O

) is correct because oxygen exists as a diatomic molecule (

O_2

), which has the lowest atomicity among the given elements.

597 Easy

597 of 705

Remembering +4 | -1

Among the phosphatic fertilizers, superphosphate of lime is a mixture of

Ca{\left( {{H_2}P{O_4}} \right)_2}

and

View answer and explanation

Correct option: A

CaS{O_4}.2{H_2}O

Option A (

CaS{O_4}.2{H_2}O

) is correct because superphosphate of lime is a mixture of calcium dihydrogen phosphate and calcium sulfate dihydrate.

598 Medium

598 of 705

Remembering +4 | -1

Formula for tear gas is

View answer and explanation

Correct option: B

{CCl}_3{NO}_2

Option B (

{CCl}_3{NO}_2

) is correct because

{CCl}_3{NO}_2

, also known as chloropicrin, is a well-known tear gas.

599 Medium

599 of 705

Remembering +4 | -1

Which is a poison?

View answer and explanation

Correct option: B

\mathrm{A}{\mathrm{s}_2}{\mathrm{O}_3}

Option B (

\mathrm{A}{\mathrm{s}_2}{\mathrm{O}_3}

) is correct because arsenic trioxide (

\mathrm{A}{\mathrm{s}_2}{\mathrm{O}_3}

) is a known poison.

600 Medium

600 of 705

Analyzing +4 | -1

Among the following, the species having square planar geometry for central atom are
i)

Xe{F_4}

, ii)

S{F_4}

, iii)

{\left[ {NiC{l_4}} \right]^{2 - }}

, iv)

{\left[ {PtC{l_4}} \right]^{2 - }}

View answer and explanation

Correct option: A

(i) and (iv)

Option A is correct. XeF4 and [PtCl4]2- have square planar geometry due to their electronic configurations and hybridization.

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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