Subject - Chemistry:

Basics

MCQ - 100-2286

Question:

Which substance produces iodine when added to solid potassium iodide?

Aqueous silver nitrate
Concentrated Hydrochloric acid
Concentrated sulphuric acid
Concentrated Hydrochloric acid

Correct Answer: C

Explanation:

Concentrates H₂SO4 functions as an oxidizing agent and it oxidises l- to l2 while itself is reduced to SO₂ S and H₂S.
H₂SO₄ + 2I- + 2H⁺→ SO₂ + I₂+ 2H₂O
H₂SO₄ + 6I- + 6H⁺→ S + 3I₂ + 4H₂O
H₂SO₄ + 8I- + 8H⁺→ H₂S + 4I₂ + 4H₂O

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