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HI can be prepared by all the following methods, except

1. (a) PI₃ + H₂O
2. (b) KI + H₂SO₄
3. (c) I₂ + H₂ → Pt →
4. (d) I₂ + H₂S

Correct answer: (b) KI + H₂SO₄

Solution

HI cannot be prepared by reacting KI with H₂SO₄ because H₂SO₄ oxidizes HI to I₂, preventing its isolation. The other methods are valid for HI preparation.

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