${\rm{C}}{{\rm{N}}^ - }$ 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 · 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 1-30 of 344 questions

1 Easy

1 of 344

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 Easy

2 of 344

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.

3 Easy

3 of 344

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.

4 Easy

4 of 344

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.

5 Easy

5 of 344

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.

6 Easy

6 of 344

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.

7 Easy

7 of 344

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.

8 Easy

8 of 344

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.

9 Easy

9 of 344

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.

10 Easy

10 of 344

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.

11 Easy

11 of 344

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.

12 Easy

12 of 344

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.

13 Easy

13 of 344

Remembering +4 | -1

Tear gas is:

View answer and explanation

Correct option: D

CC{l_3}.N{O_2}

Option D (

CC{l_3}.N{O_2}

) is correct because Nitrochloroform (

CC{l_3}.N{O_2}

) is commonly known as tear gas.

14 Easy

14 of 344

Remembering +4 | -1

The chemical used for cooling in refrigeration or in manufacture of ice is:

View answer and explanation

Correct option: D

Liquid

N{H_3}

Option D (Liquid

N{H_3}

) is correct because liquid ammonia has a high heat of vaporization, making it effective for cooling.

15 Easy

15 of 344

Remembering +4 | -1

Which oxide of nitrogen is obtained by heating ammonium nitrate?

View answer and explanation

Correct option: C

\mathrm{N}_2 \mathrm{O}

Option C (

\mathrm{N}_2 \mathrm{O}

) is correct because heating ammonium nitrate produces nitrous oxide (

\mathrm{N}_2 \mathrm{O}

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16 Easy

16 of 344

Understanding +4 | -1

Ammonia water is a good cleaning agent because it:

View answer and explanation

Correct option: D

All are true

The correct answer is D (All are true) because ammonia water is a good cleaning agent due to its weakly basic nature, ability to emulsify grease, and property of leaving no residue.

17 Easy

17 of 344

Remembering +4 | -1

In the contact process of

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4},\mathrm{\;S}{\mathrm{O}_3}

dissolves in sulphuric acid to give:

View answer and explanation

Correct option: C

Pyrosulphuric acid

Option C (Pyrosulphuric acid) is correct because

SO_3

dissolves in sulphuric acid to form pyrosulphuric acid (

H_2S_2O_7

18 Easy

18 of 344

Analyzing +4 | -1

Statement-I : Oxygen shows only -2 oxidation state.

Statement-II : On moving top to bottom, stability of +4 oxidation state decreases, whereas that of +6 oxidation state increases.

View answer and explanation

Correct option: B

Both Statement I and Statement II are incorrect.

Option B (Both Statement I and Statement II are incorrect.) is correct because oxygen can exhibit positive oxidation states, and the stability of +6 oxidation state decreases down the group due to the inert pair effect.

19 Easy

19 of 344

Remembering +4 | -1

Which of the following is responsible for depletion of the ozone layer in the upper strata of atmosphere?

View answer and explanation

Correct option: D

Freons

Option D (Freons) is correct because Freons (chlorofluorocarbons) release chlorine radicals that deplete the ozone layer.

20 Easy

20 of 344

Analyzing +4 | -1

In which case, the order of acidic strength is not correct?

View answer and explanation

Correct option: B

HI{O_4} > HBr{O_4} > HCI{O_4}

Option B is correct because the acidic strength of oxyacids decreases down the group, so the correct order should be

HClO_4 > HBrO_4 > HIO_4

21 Easy

21 of 344

Remembering +4 | -1

The zero group members are collectively known as:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because zero group members are also known as inert gases, rare gases, and noble gases due to their properties.

22 Easy

22 of 344

Remembering +4 | -1

Cold fire is related to

View answer and explanation

Correct option: A

White P

Option A (White P) is correct because white phosphorus exhibits phosphorescence, a phenomenon known as cold fire, due to its oxidation in air.

23 Easy

23 of 344

Remembering +4 | -1

The substance used in smoke screen is

View answer and explanation

Correct option: D

Calcium phosphide

Option D (Calcium phosphide) is correct because calcium phosphide reacts with water to produce phosphine gas, which spontaneously ignites and creates a smoke screen.

24 Easy

24 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.

25 Easy

25 of 344

Understanding +4 | -1

Chlorous acid and its salts (chlorites) are:

View answer and explanation

Correct option: D

Good oxidising and bleaching agents

Option D is correct because chlorous acid and its salts can act as both oxidizing and bleaching agents due to the release of nascent oxygen.

26 Easy

26 of 344

Analyzing +4 | -1

Assertion (A):

\mathrm{O}_3

is better oxidizing agent than

\mathrm{H}_2 \mathrm{O}_2.

Reason (R):

\mathrm{O}_3

converts 'Ag' to

\mathrm{Ag}_2 \mathrm{O}.

View answer and explanation

Correct option: B

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

Option B is correct because both the assertion and reason are true, but the reason doesn't explain why ozone is a better oxidizing agent than hydrogen peroxide.

27 Easy

27 of 344

Analyzing +4 | -1

Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by other

View answer and explanation

Correct option: B

Used as a food preservative

Option B is correct because SO₂ is used as a food preservative due to its antioxidant properties, while NO₂ is not.

28 Easy

28 of 344

Remembering +4 | -1

Dry bleaching is done by:

View answer and explanation

Correct option: C

{O_3}

Option C (

{O_3}

) is correct because ozone is used for dry bleaching processes.

29 Easy

29 of 344

Understanding +4 | -1

Tailing of

Hg

caused by ozone, is due to the formation of

View answer and explanation

Correct option: B

H{g_2}O

Option B (

H{g_2}O

) is correct because ozone oxidizes mercury to form mercurous oxide, which causes tailing.

30 Easy

30 of 344

Remembering +4 | -1

….. liberates oxygen from water.

View answer and explanation

Correct option: C

{F_2}

Option C (F₂) is correct because fluorine is a strong oxidizing agent and can oxidize water to liberate oxygen.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 344 single-correct-answer MCQs on P-BLOCK ELEMENTS.
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