Chemistry 12 Chapter 7 Exemplar Solutions the P Block Elements Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)

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V. Assertion and Reason Type

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

(i) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.

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

(iii) Assertion is correct, but reason is wrong statement.

(iv) Assertion is wrong but reason is correct statement.

(v) Both assertion and reason are wrong statements.

Question 64:

Assertion: is less reactive than .

Reason: Nitrogen has more electron gain enthalpy than phosphorus.

Answer: (iii)

Question 65:

Assertion: makes iron passive.

Reason: forms a protective layer of ferric nitrate on the surface of iron.

Answer: (iii)

Question 66:

Assertion: cannot be prepared by the reaction of with concentrated

Reason: has lowest bond strength among halogen acids.

Answer: (ii)

Question 67:

Assertion: Both rhombic and monoclinic sulphur exist as but oxygen exists as .

Reason: Oxygen forms multiple bond due to small size and small bond length but bonding is not possible in sulphur.

Answer: (i)

Question 68:

Assertion: reacts with concentrated to give colourless fumes with pungent smell. But on adding the fumes become greenish yellow.

Reason: oxidises to chlorine gas which is greenish yellow.

Answer: (i)

Question 69:

Assertion: cannot be hydrolysed but can be.

Reason: Six atoms in prevent the attack of on sulphur atom of .

Answer: (i)