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AIIMS2018Chemistry-Inorganic Chemistry

AIIMS 2018 Chemistry Reactions of Manganese Compounds MCQ Question

Type: MCQ-conceptual-Medium-Class 11

MnO2+NaCl→H+/H2SO4\text{MnO}_2 + \text{NaCl} \xrightarrow{\text{H}^+ / \text{H}_2\text{SO}_4}

Choose the incorrect statement for the above reaction.

A

Mn\text{Mn} goes from +4+4 to +2+2

B

Cl−\text{Cl}^- is oxidized

C

Cl2\text{Cl}_2 yellow gas is released.

D

SO42−\text{SO}_4^{2-} reduces to SO2\text{SO}_2

Correct Answer

Option A

Detailed Explanation

When manganese dioxide (MnO₂) reacts with sodium chloride (NaCl) in the presence of sulfuric acid (H₂SO₄) and hydrogen ions (H⁺), it facilitates the oxidation of chloride ions (Cl⁻) to chlorine gas (Cl₂). This redox reaction occurs because MnO₂ acts as an oxidizing agent, while the chloride ions are oxidized, resulting in the release of Cl₂ gas.

Option B, hydrogen chloride (HCl), is not produced in this reaction as the primary outcome is chlorine gas. Option C, manganese chloride (MnCl₂), may form but is not the main product of interest here. Option D, sodium sulfate (Na₂SO₄), is not formed since the sulfate ions remain unreacted in this specific reaction context.

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