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Chlorine is liberated, when we heat

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Chlorine is liberated, when we heat
A. (1) `KMnO_4 + NaCI`
B. (2) `K_2Cr_2O_7 + MnO_2`
C. (3) `Pb(NO_3)_2 + MnO_2 `
D. (4) `K_2Cr_2O_7+HCl`
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Correct Answer - D
Only `K_2Cr_2O_7` and HCl will give `Cl_2`
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