Assertion and Reason Questions on Class 12 Chemistry Chapter 7 p-BLOCK ELEMENTS (GROUP 15, 16, 17 AND 18)

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Q.1. Assertion : Dinitrogen is inert at room temperature.
Reason : Dinitrogen directly combines with lithium to form ionic nitrides.

Answer

Q.2. Assertion : N2 is less reactive than P4.
Reason : Nitrogen has more electron gain enthalpy than phosphorus.

Answer

Q.3. Assertion : When a metal is treated with conc. HNO3 it generally yields a nitrate, NO2 and H2O.
Reason : Conc. HNO3 reacts with metal and first produces a metal nitrate and nascent hydrogen. The nascent hydrogen then further reduces HNO3 to NO2

Answer

Q.4. Assertion : White phosphorus is more reactive than red phosphorus.
Reason : Red phosphorus consists of P4 tetrahedral units linked to one another to form linear chains.

Answer

Q.5. Assertion : Bond angle of H2S is smaller than H2O.
Reason : Electronegativity of the central atom increases, bond angle decreases.

Answer

Q.6. Assertion : Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O2.
Reason : Oxygen forms pπ – pπ multiple bond due to small size and small bond length but pπ – pπ bonding is not possible in sulphur.

Answer

Q.7. Assertion : SF6 cannot be hydrolysed but SF4 can be.
Reason : Six F atoms in SF6 prevent the attack of H2O on sulphur atom of SF6.

Answer

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