Chapter Exam

Unit 10: p-Block Elements — Online MCQ Test

Q: Which of the following oxoacid of sulphur has — O — O — linkage?

Answer: B. H2S2O8, peroxodisulphuric acid — Peroxodisulphuric acid (H2S2O8) contains a peroxide linkage (—O—O—).

Q: When copper is heated with conc. HNO3 it produces:

Answer: D. Cu(NO3)2 and NO2 — Copper reacts with concentrated nitric acid to produce copper(II) nitrate, water, and reddish-brown nitrogen dioxide gas: Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2.

Q: The correct order of N-compounds in its decreasing order of oxidation states is:

Answer: B. HNO3, NO, N2, NH4Cl — Oxidation states are: HNO3 (+5), NO (+2), N2 (0), NH4Cl (-3). Decreasing order: +5 > +2 > 0 > -3.

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Practice Unit 10: p-Block Elements with a free chapter-wise online MCQ test for NEET NEET (All) CHEMISTRY. This chapter covers: Group -13 to Group 18 Elements General Introduction: Electronic configuration and general trends in physical and chemical properties of elements across the periods and down the gro.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 10: p-Block Elements — Important Questions & Answers (FAQ)

Frequently asked questions from NEET NEET (All) CHEMISTRY — Unit 10: p-Block Elements, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following oxoacid of sulphur has — O — O — linkage?

A. H2SO4, sulphuric acid
B. H2S2O8, peroxodisulphuric acid ✓
C. H2S2O7, pyrosulphuric acid
D. H2SO3, sulphurous acid

Answer: B. H2S2O8, peroxodisulphuric acid
Peroxodisulphuric acid (H2S2O8) contains a peroxide linkage (—O—O—).

Which of the following is not correct about carbon monoxide?

A. It reduces oxygen carrying ability of blood.
B. The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin. ✓
C. It is produced due to incomplete combustion.
D. It forms carboxyhaemoglobin.

Answer: B. The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
Carboxyhaemoglobin is about 300 times more stable than oxyhaemoglobin, which is why CO poisoning is dangerous.

Given below are two statements: Statement I: Like nitrogen that can form ammonia, arsenic can form arsine. Statement II: Antimony cannot form antimony pentoxide.

A. Both Statement I and Statement II are correct.
B. Both Statement I and Statement II are incorrect.
C. Statement I is correct but Statement II is incorrect. ✓
D. Statement I is incorrect but Statement II is correct.

Answer: C. Statement I is correct but Statement II is incorrect.
Statement I is correct (AsH₃ is arsine). Statement II is incorrect because Antimony forms Sb₂O₅ (antimony pentoxide).

When copper is heated with conc. HNO3 it produces:

A. Cu(NO3)2 and NO
B. Cu(NO3)2, NO and NO2
C. Cu(NO3)2 and N2O
D. Cu(NO3)2 and NO2 ✓

Answer: D. Cu(NO3)2 and NO2
Copper reacts with concentrated nitric acid to produce copper(II) nitrate, water, and reddish-brown nitrogen dioxide gas: Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2.

The correct order of N-compounds in its decreasing order of oxidation states is: