1:2 conc. $HN{O_3}$ and conc. $HCl$

3:1 conc. $HN{O_3}$ and conc. $HCl$

2:1 conc. $HN{O_3}$ and conc. $HCl$

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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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481 Medium

481 of 705

Analyzing +4 | -1

Which of the following compound have maximum oxidising nature?

View answer and explanation

Correct option: A

{Cl}_2 {O}

Option A (

{Cl}_2 {O}

) is correct because the oxidizing nature of chlorine oxides decreases as the oxidation state of chlorine increases, making Cl2O the strongest oxidizing agent.

482 Medium

482 of 705

Remembering +4 | -1

Chlorine bleaches only in the:

View answer and explanation

Correct option: D

Presence of moisture

Option D (Presence of moisture) is correct because chlorine bleaches due to the formation of hypochlorous acid (HOCl) in the presence of moisture, which then decomposes to release nascent oxygen.

483 Medium

483 of 705

Remembering +4 | -1

The non-metal other than graphite having metallic lustre is:

View answer and explanation

Correct option: A

{\mathrm{I}_2}

Option A (

{\mathrm{I}_2}

) is correct because Iodine is a non-metal that exhibits metallic luster.

484 Easy

484 of 705

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.

485 Medium

485 of 705

Analyzing +4 | -1

Statement I: Elemental

P

is much more reactive than elemental nitrogen

Statement II: In

\mathrm{P}_4

, all P-P bonds are single covalent bonds while in

\mathrm{N}_2

there is a triple bond between nitrogen atoms

View answer and explanation

Correct option: A

Statement I and statement II are correct and statement II is the correct explanation of statement I

Option A (Statement I and statement II are correct and statement II is the correct explanation of statement I) is correct because P4 is more reactive due to weaker single bonds compared to the strong triple bond in N2.

486 Medium

486 of 705

Understanding +4 | -1

S-I: In metal halides, metal in its higher oxidation state will be more covalent then the one in lower oxidation state.

S-II:

{BrF}_5

is colour less liquid.

View answer and explanation

Correct option: A

Both S-I and S-II are true

Option A (Both S-I and S-II are true) is correct because both statements regarding metal halide covalency and the properties of BrF5 are factually accurate.

487 Easy

487 of 705

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.

488 Easy

488 of 705

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.

489 Easy

489 of 705

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).

490 Easy

490 of 705

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.

491 Medium

491 of 705

Understanding +4 | -1

The weakest acid among the following is:

View answer and explanation

Correct option: D

HCl

Option A is correct because HClO is the weakest acid among the given options due to the lower electronegativity of chlorine and the presence of fewer oxygen atoms compared to HClO3.

492 Easy

492 of 705

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}

493 Medium

493 of 705

Understanding +4 | -1

Which of the following bonds will be most polar?

View answer and explanation

Correct option: C

N - F

Option C (

N - F

) is correct because the electronegativity difference between nitrogen and fluorine is the greatest among the given options, leading to the most polar bond.

494 Medium

494 of 705

Understanding +4 | -1

When

{H_2}S

reacts with halogens,halogens:

View answer and explanation

Correct option: B

Are reduced

Option B (Are reduced) is correct because in the reaction of H2S with halogens, halogens gain electrons and are thus reduced.

495 Easy

495 of 705

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}

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496 Medium

496 of 705

Application +4 | -1

At T (K), 100 L of dry oxygen is present in a sealed container. It is subjeceted to silent electric discharge, till the volumes of oxygen and ozone becomes equal .what is the volume of ozone formed at T (K)?

View answer and explanation

Correct option: D

The correct answer is D (40) because the volume of ozone formed is calculated based on the stoichiometry of the reaction and the final equal volumes of oxygen and ozone.

497 Medium

497 of 705

Analyzing +4 | -1

Which of the following is a disproportionation reaction?

View answer and explanation

Correct option: A

{Cl}_2

(g)

+2 {OH}^{-}(\mathrm{aq}) \rightarrow {ClO}^{-}(\mathrm{aq})+{Cl}^{-}(\mathrm{aq})+{H}_2 {O}({l})

Option A (

{Cl}_2

(g)

+2 {OH}^{-}(\mathrm{aq}) \rightarrow {ClO}^{-}(\mathrm{aq})+{Cl}^{-}(\mathrm{aq})+{H}_2 {O}({l})

) is correct because Chlorine undergoes both oxidation and reduction in the same reaction.

498 Easy

498 of 705

Analyzing +4 | -1

Which oxide is of different type than others?

View answer and explanation

Correct option: D

N{a_2}{O_2}

Option D is the oxide of a different type because Na2O2 is a peroxide, while the others are dioxides.

499 Easy

499 of 705

Remembering +4 | -1

The inert gases present in atmosphere are:

View answer and explanation

Correct option: D

He, Ne, Ar, Kr and Xe

Option D (He, Ne, Ar, Kr and Xe) is correct because all of these are inert gases present in the atmosphere.

500 Medium

500 of 705

Remembering +4 | -1

Brown colour acidic oxide among the following is

View answer and explanation

Correct option: B

{NO}_2

Option B (

{NO}_2

) is correct because nitrogen dioxide (

{NO}_2

) is a brown gas and an acidic oxide, contributing to acid rain and smog.

501 Medium

501 of 705

Remembering +4 | -1

With which of the following metal dil.

{HNO}_3

produces nitrous oxide?

View answer and explanation

Correct option: B

{Zn}

Option B (

{Zn}

) is correct because zinc reacts with dilute nitric acid to produce nitrous oxide.

502 Easy

502 of 705

Understanding +4 | -1

Assertion: Halogens have characteristic colour.

Reason: Halogens readily accepts electrons to form halide ion.

View answer and explanation

Correct option: B

Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.

Option B is correct. Halogens have characteristic colors due to the absorption of light, and they readily accept electrons due to their high electronegativity, but the color is not directly caused by electron affinity.

503 Medium

503 of 705

Analyzing +4 | -1

Assertion: Pure

N_2

is obtained from

Ba\left(N_3\right)_2

but not from

\left(NH_4\right)_2 Cr_2 O_7

Reason: On decomposition

\left(NH_4\right)_2 Cr_2 O_7

gives

O_2

gas.

View answer and explanation

Correct option: C

If Assertion is correct but Reason is incorrect.

The correct answer is C because the assertion is correct (pure N2 is obtained from Ba(N3)2) but the reason is incorrect (decomposition of (NH4)2Cr2O7 does not give O2 gas).

504 Medium

504 of 705

Remembering +4 | -1

Dinitrogen pentoxide a colourless solid is prepared by

View answer and explanation

Correct option: C

Dehydrating

\mathrm{HN}{\mathrm{O}_3}

with

{\mathrm{P}_\mathrm{4}}{\mathrm{O}_{\mathrm{10}}}

Option C, Dehydrating

\mathrm{HN}{\mathrm{O}_3}

with

{\mathrm{P}_\mathrm{4}}{\mathrm{O}_{\mathrm{10}}}

, is correct because

\mathrm{P}{\mathrm{4}}{\mathrm{O}_{\mathrm{10}}}

is a strong dehydrating agent that removes water from nitric acid to form dinitrogen pentoxide.

505 Easy

505 of 705

Remembering +4 | -1

Aqua-regia is

View answer and explanation

Correct option: A

1:3 conc.

HN{O_3}

and conc.

HCl

Option A (1:3 conc.

HN{O_3}

and conc.

HCl

) is incorrect. The correct ratio for Aqua regia is 1 part concentrated Nitric Acid to 3 parts concentrated Hydrochloric acid.

506 Easy

506 of 705

Understanding +4 | -1

Which of the following hydrides has lowest boiling point?

View answer and explanation

Correct option: B

\mathrm{H}_2 \mathrm{~S}

Option B (H₂S) is correct because among the given hydrides, H₂S has the lowest boiling point due to weaker intermolecular forces compared to H₂O (hydrogen bonding) and heavier hydrides (increased van der Waals forces).

507 Easy

507 of 705

Remembering +4 | -1

What is the formula of Marshalls acid

View answer and explanation

Correct option: A

\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8

Option A (

\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8

) is correct because the chemical formula for Marshall's acid, also known as peroxydisulfuric acid, is

\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8

508 Medium

508 of 705

Analyzing +4 | -1

Which of the following statement is true?

View answer and explanation

Correct option: D

\mathrm{HN}{\mathrm{O}_\mathrm{3}}

is a stronger acid than

\mathrm{HN}{\mathrm{O}_\mathrm{2}}

The correct answer is D (

\mathrm{HN}{\mathrm{O}_\mathrm{3}}

is a stronger acid than

\mathrm{HN}{\mathrm{O}_\mathrm{2}}

) because nitric acid (

HNO_3

) has more oxygen atoms bonded to the central nitrogen atom, which increases the polarity of the O-H bond and makes it a stronger acid.

509 Easy

509 of 705

Remembering +4 | -1

Holme’s signals can be obtained by using

View answer and explanation

Correct option: B

Ca{C_2} + C{a_3}{P_2}

Option B (

Ca{C_2} + C{a_3}{P_2}

) is correct because Holmes' signals are produced by the reaction of calcium carbide (

Ca{C_2}

) and calcium phosphide (

C{a_3}{P_2}

) with water, generating acetylene and phosphine, which ignite spontaneously.

510 Hard

510 of 705

Understanding +4 | -1

The ionic character of the metal halides,

M \mathrm{Cl}

M \mathrm{I}, M \mathrm{Br}, M \mathrm{~F}

decreases in the order:

View answer and explanation

Correct option: C

M \mathrm{~F}>M \mathrm{Cl}>M \mathrm{Br}>M \mathrm{I}

Option C (

M \mathrm{~F}>M \mathrm{Cl}>M \mathrm{Br}>M \mathrm{I}

) is correct because ionic character decreases with increasing size of the halide ion due to increased polarizability.

Revision notes and key takeaways

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