The treatment of galena with $\mathrm{HNO}_{3}$ produces a gas that is

(A) paramagnetic; (D) colorless

JEE Advanced · 2022 · 28 Aug 2022 · Paper 1 · p-Block Elements

The treatment of galena with

HNO_{3}

produces a gas that is

(A)paramagnetic✓ Correct
(B)bent in geometry
(C)an acidic oxide
(D)colorless✓ Correct

Answer: (A), (D)

Solution

Galena (PbS) reacts with

HNO_{3}

3 PbS + 8 HNO_{3} \to 3 Pb (NO_{3})_{2} + 2 NO + 4 H_{2} O + S

The gas produced is NO (nitric oxide).

(A) NO has an unpaired electron and is paramagnetic. Correct.

(B) NO has a linear geometry, not bent. Incorrect.

(C) NO is a neutral oxide, not acidic. Incorrect.

(D) NO is a colorless gas. Correct.

JEE Advanced · 2022 · 28 Aug 2022 · Paper 1 · One or more correct options

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