Chlorine is liberated, when we heat

Options

(a) Pb(NO₃)₂ + MnO₂
(b) K₂Cr₂O₇ + MnO₂
(c) KMnO₄ + NaCl
(d) K₂Cr₂O₇ + HCl

Correct Answer:

K₂Cr₂O₇ + HCl

Explanation:

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