${\rm{C}}{{\rm{N}}^ - }$ ion and ${{\rm{N}}_2}$ are isoelectronic but in contrast to ${\rm{C}}{{\rm{N}}^ - },{\rm{\;}}{{\rm{N}}_2}$ is chemically inert because of:

Unsymmetrical electron distribution

Presence of more number of electrons in bonding orbitals

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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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Showing 1-30 of 705 questions

1 Easy

1 of 705

Remembering +4 | -1

The gas used for inflating the tyres of aeroplanes is:

View answer and explanation

Correct option: B

\mathrm{He}

Option B (He) is correct because Helium is the lightest non-inflammable gas after Hydrogen, making it suitable for inflating aircraft tires.

2 Medium

2 of 705

Remembering +4 | -1

Which of the following is correct stability order of oxides of

17^{\text {th }}

group elements is:

View answer and explanation

Correct option: C

\mathrm{I}_2>\mathrm{Cl}_2>\mathrm{Br}_2

Option D (

\mathrm{Cl}_2>\mathrm{I}_2>\mathrm{Br}_2

) is incorrect, the correct order is

\mathrm{Cl}_2O > \mathrm{Br}_2O > \mathrm{I}_2O

3 Medium

3 of 705

Analyzing +4 | -1

Assertion: Ozone is a powerful oxidising agent in comparison to

{O}_2

.

Reason: Ozone is diamagnetic but

{O}_2

is paramagnetic.

View answer and explanation

Correct option: B

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

Option B (If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion) is correct because ozone is a stronger oxidizing agent than oxygen, and ozone is diamagnetic while oxygen is paramagnetic, but the paramagnetism of oxygen is not the reason for ozone's stronger oxidizing power.

4 Easy

4 of 705

Remembering +4 | -1

Which of the following is kept in water?

View answer and explanation

Correct option: A

White phosphorus

Option A (White phosphorus) is correct because white phosphorus is highly reactive and spontaneously ignites in air, so it's stored under water.

5 Easy

5 of 705

Understanding +4 | -1

\mathrm{C}{\mathrm{N}^ - }

ion and

{\mathrm{N}_2}

are isoelectronic but in contrast to

\mathrm{C}{\mathrm{N}^ - },\mathrm{\;}{\mathrm{N}_2}

is chemically inert because of:

View answer and explanation

Correct option: B

Absence of bond polarity

Option B (Absence of bond polarity) is correct because N2 is chemically inert due to its non-polar nature and high bond energy, unlike the polar CN- ion.

6 Medium

6 of 705

Understanding +4 | -1

Consider the following statements

(i) Reaction

2 {Fe}^{3+}+{SO}_2+2 {H}_2 {O} \rightarrow 2 {Fe}^{2+}+{SO}_4^{2-}+4 {H}^{+}

shows reducing character of sulphur dioxide

(ii)

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

contains four

{S}={O}

, two

{S}-{OH}

and one

{O}-

{O}

bond

(iii)

{NH}_3

gas can be dried effectively by using conc.

{H}_2 {SO}_4

.

(iv) One of the major use of

{H}_2 {SO}_4

is in the manufacture of fertilizers.

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

View answer and explanation

Correct option: B

TTFT

Option B (TTFT) is correct because statements (i), (ii), and (iv) are true, while statement (iii) is false due to the reaction between ammonia and sulfuric acid.

7 Easy

7 of 705

Remembering +4 | -1

Superphosphate of lime is used in:

View answer and explanation

Correct option: C

Agriculture

Option C (Agriculture) is correct because superphosphate of lime is a fertilizer used to provide phosphorus to plants.

8 Easy

8 of 705

Analyzing +4 | -1

Statement I: The bond angle in

\mathrm{NH}_3

is more than that of

\mathrm{PH}_3

Statement II: Increasing size and decreasing electronegativity of central atom permit the bonding electrons to be drawn out further, lowering the repulsion between the bonding pairs

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 the bond angle in NH3 is greater than PH3 due to the smaller size and higher electronegativity of Nitrogen.

9 Hard

9 of 705

Understanding +4 | -1

Assertion (A):

{SO}_2

converts ferric ions to ferrous ions.

Reason (R):

{SO}_2

act as reducing agent.

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

The correct answer is A (Both (A) and (R) are true and (R) is the correct explanation of (A)) because sulfur dioxide reduces ferric ions to ferrous ions by acting as a reducing agent.

10 Medium

10 of 705

Analyzing +4 | -1

Assertion (A) : Each

\mathrm{N}

-atom is

s p^3

-hybridised in

\mathrm{N}_2 \mathrm{H}_4

.

Reason (R) : It has gauche conformation.

View answer and explanation

Correct option: B

Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

Both A and R are true but R is not the correct explanation of A because while N_2H_4 does have sp³ hybridized N atoms and a gauche conformation, the conformation doesn't explain the hybridization.

11 Hard

11 of 705

Analyzing +4 | -1

Assertion: Salts of

\mathrm{H}_3 \mathrm{PO}_3

and

\mathrm{H}_3 \mathrm{PO}_4

used as a fertilizers.

Reason: Formed

\mathrm{H}_3 \mathrm{PO}_3

increases solubility of water in soil on addition of phosphate fertilizers.

View answer and explanation

Correct option: A

If both Assertion & Reason are True & the Reason is correct explanation of the Assertion

Option A is correct. Salts of both

H_3PO_3

and

H_3PO_4

are used as fertilizers, and

H_3PO_3

increases water solubility in soil when phosphate fertilizers are added.

12 Medium

12 of 705

Understanding +4 | -1

Which is correct statement?

View answer and explanation

Correct option: C

Nitric oxide is an endothermic compound

Option C is correct. Nitric oxide (NO) is an endothermic compound, meaning its formation requires energy input (positive enthalpy change).

13 Easy

13 of 705

Remembering +4 | -1

Freons are used as:

View answer and explanation

Correct option: A

Refrigerant

Option A (Refrigerant) is correct because freons are commonly used as refrigerants due to their properties.

14 Medium

14 of 705

Analyzing +4 | -1

Which of the following will not form disproportionated product?

View answer and explanation

Correct option: D

{XeF}_2+{H}_2 {O} \longrightarrow

Option D is correct because XeF2 reacts with water to form Xe, HF, and O2, without disproportionation.

15 Easy

15 of 705

Analyzing +4 | -1

Which of the following pair have same hybridisation for central atom?

View answer and explanation

Correct option: D

\mathrm{XeF}_2

and

\mathrm{I}_3^{-}

Option D (

\mathrm{XeF}_2

and

\mathrm{I}_3^{-}

) is correct because both have

sp^3d

hybridization for the central atom.

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16 Medium

16 of 705

Application +4 | -1

Iodine reacts with concentrated

HN{O_3}

to yield Y along with other products. The oxidation state of iodine in

Y,

View answer and explanation

Correct option: D

Option D (5) is correct because iodine reacts with concentrated HNO₃ to form iodic acid (HIO₃), where the oxidation state of iodine is +5.

17 Easy

17 of 705

Understanding +4 | -1

Xenon best reacts with:

View answer and explanation

Correct option: B

The most electronegative element

Option B (The most electronegative element) is correct because xenon, being a noble gas, reacts best with highly electronegative elements like fluorine and oxygen.

18 Medium

18 of 705

Understanding +4 | -1

Which would quickly absorb oxygen?

View answer and explanation

Correct option: A

Alkaline solution of pyrogallic acid

Option A (Alkaline solution of pyrogallic acid) is correct because alkaline pyrogallol readily absorbs oxygen, making it suitable for removing oxygen from gas mixtures.

19 Medium

19 of 705

Analyzing +4 | -1

The true statement for the acids of phosphorus,

\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3

and

\mathrm{H}_3 \mathrm{PO}_4

View answer and explanation

Correct option: D

The geometry of phosphorus is tetrahedral in all the three

Option D is correct because

\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3

and

\mathrm{H}_3 \mathrm{PO}_4

all have phosphorus with

sp^3

hybridization, resulting in a tetrahedral geometry.

20 Medium

20 of 705

Understanding +4 | -1

Assertion (A):

\mathrm{N}_2 \mathrm{O}_5

is not possible due to

Reason (R): incapability of 'N' to show pentavalency Max. covalency of 'N' can be 4.

View answer and explanation

Correct option: D

Both (A) and (R) are false

Option D is correct because N2O5 is a known compound, and nitrogen can exhibit a covalency of more than 4 using d-orbitals, though it is less common.

21 Medium

21 of 705

Analyzing +4 | -1

When

\mathrm{C}{\mathrm{l}_2}

water is added to an aqueous solution of potassium halide in presence of chloroform a violet colour is obtained. On adding more of

\mathrm{C}{\mathrm{l}_2}

water, the violet colour disappears and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution:

View answer and explanation

Correct option: A

Iodide

Option A (Iodide) is correct because the violet color in chloroform indicates the presence of iodine, which is formed by the reaction of iodide with chlorine water. The disappearance of the color with excess chlorine water indicates further oxidation of iodine.

22 Easy

22 of 705

Remembering +4 | -1

Ammonia is:

View answer and explanation

Correct option: A

Polar solvent

Option A (Polar solvent) is correct because ammonia (

N{H_3}

) is a polar molecule and acts as a polar solvent.

23 Hard

23 of 705

Understanding +4 | -1

Assertion (A):

{Cr},{Al}, {Fe}

and

{Ni}

are passive with concentrated Nitric acid.

Reason (R): Thin film of oxide layer is formed which prevents further action of concentrated Nitric acid on metal.

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

The correct answer is A (Both (A) and (R) are true and (R) is the correct explanation of (A)) because Cr, Al, Fe, and Ni become passive due to the formation of a protective oxide layer.

24 Easy

24 of 705

Application +4 | -1

In which of the following compound central atom has

+4

oxidation state?

View answer and explanation

Correct option: B

\mathrm{H}_2 \mathrm{SO}_3

The correct answer is B (

\mathrm{H}_2 \mathrm{SO}_3

) because the oxidation state of sulfur in this compound is +4.

25 Medium

25 of 705

Analyzing +4 | -1

Given below are two statements:
Statement I: Noble gases have very high boiling
points
Statement II: Noble gases are monoatomic gases.
They are held together by strong dispersion forces.
Because of this they are liquefied at very low
temperature. Hence, they have very high boiling
points.
In the light of the above statements, choose the
correct answer from the options given below.

View answer and explanation

Correct option: B

Both statement I and statement II are false

The correct answer is B (Both statement I and statement II are false) because noble gases have very *low* boiling points due to *weak* dispersion forces.

26 Easy

26 of 705

Understanding +4 | -1

The correct order of reducing abilities of hydrides of V group elements is

View answer and explanation

Correct option: A

N{H_3} < P{H_3} < As{H_3} < Sb{H_3} < Bi{H_3}

Option A (

N{H_3} < P{H_3} < As{H_3} < Sb{H_3} < Bi{H_3}

) is correct because the reducing ability of hydrides increases down the group due to decreasing bond strength and stability.

27 Hard

27 of 705

Analyzing +4 | -1

Assertion (A):

C l F

is more reactive than

F_2

.

Reason (R): The

F-F

bond is weaker than

ClF

bond.

View answer and explanation

Correct option: D

(A) is false and (R) is true

Option D is correct because the F-F bond is indeed weaker than the Cl-F bond, but this makes ClF more reactive, not less. Therefore, the assertion is false, and the reason is true.

28 Easy

28 of 705

Remembering +4 | -1

The only element in VIA group or group 16 elements, which is definitely a metal, is:

View answer and explanation

Correct option: D

Polonium

Option D (Polonium) is correct because metallic character increases down the group, and Polonium is the last element in Group 16 that exhibits metallic properties.

29 Medium

29 of 705

Analyzing +4 | -1

Which statement is incorrect.

View answer and explanation

Correct option: C

Br

can be prepared from carnalite

The correct answer is D (Br can be prepared from carnalite) because bromine is not directly prepared from carnallite.

30 Medium

30 of 705

Understanding +4 | -1

Among the halogens, the one which is oxidised by nitric acid is

View answer and explanation

Correct option: B

Iodine

Option B (Iodine) is correct because nitric acid oxidizes iodine to iodic acid.

Revision notes and key takeaways

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Key Takeaways

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