Chapter Exam

Chapter 3: p-Block Elements - II — Online MCQ Test

Q: Which oxoacid of phosphorus is a strong reducing agent?

Answer: B. H3PO3 — Phosphorous acid, H3PO3, contains P–H bonds and acts as a reducing agent. Phosphoric acid, H3PO4, does not show this property.

Q: Which of the following is an interhalogen compound?

Answer: C. ICl — Interhalogen compounds are formed between two different halogens. ICl is an interhalogen compound, whereas Cl2, Br2, and F2 are diatomic halogens.

Q: Which of the following oxoacids contains a P–O–P linkage?

Answer: C. H4P2O7 — Pyrophosphoric acid, H4P2O7, contains a P–O–P linkage formed by condensation of two phosphoric acid molecules. This linkage is absent in the other options.

Q: Arrange the following halogens in increasing order of oxidizing power:

Answer: B. I2 < Br2 < Cl2 < F2 — Among halogens, oxidizing power decreases down the group. Fluorine is the strongest oxidizing agent, while iodine is the weakest among the given halogens.

Q: The correct statement about noble gases is:

Answer: A. They have completely filled valence shells and generally show low reactivity — Noble gases have stable, completely filled valence shells, which makes them largely unreactive. Their low reactivity is the reason they were long called inert gases.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 3: p-Block Elements - II with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: This chapter covers groups 15 through 18 including nitrogen phosphorus oxygen halogens and noble gases. It details oxoacids interhalogen compounds preparation of industrial gases a.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 3: p-Block Elements - II — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 3: p-Block Elements - II, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which oxoacid of phosphorus is a strong reducing agent?

A. H3PO4
B. H3PO3 ✓
C. H4P2O7
D. HPO3

Answer: B. H3PO3
Phosphorous acid, H3PO3, contains P–H bonds and acts as a reducing agent. Phosphoric acid, H3PO4, does not show this property.

Which of the following is an interhalogen compound?

A. Cl2
B. Br2
C. ICl ✓
D. F2

Answer: C. ICl
Interhalogen compounds are formed between two different halogens. ICl is an interhalogen compound, whereas Cl2, Br2, and F2 are diatomic halogens.

Which of the following oxoacids contains a P–O–P linkage?

A. H3PO4
B. H3PO3
C. H4P2O7 ✓
D. H3PO2

Answer: C. H4P2O7
Pyrophosphoric acid, H4P2O7, contains a P–O–P linkage formed by condensation of two phosphoric acid molecules. This linkage is absent in the other options.

Arrange the following halogens in increasing order of oxidizing power:

A. F2 < Cl2 < Br2 < I2
B. I2 < Br2 < Cl2 < F2 ✓
C. Br2 < I2 < Cl2 < F2
D. Cl2 < F2 < Br2 < I2

Answer: B. I2 < Br2 < Cl2 < F2
Among halogens, oxidizing power decreases down the group. Fluorine is the strongest oxidizing agent, while iodine is the weakest among the given halogens.

The correct statement about noble gases is:

A. They have completely filled valence shells and generally show low reactivity ✓
B. They have incomplete valence shells and form ionic compounds easily
C. They are highly electropositive metals
D. They readily form double bonds with oxygen

Answer: A. They have completely filled valence shells and generally show low reactivity
Noble gases have stable, completely filled valence shells, which makes them largely unreactive. Their low reactivity is the reason they were long called inert gases.

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