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Which of the following reaction not possible?

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${KMnO}_{4} + HCl \overset{H^{+}}{\to} {Cl}_{2} + {Mn}^{+ 2}$

$O_{3} + PbS \to {PbSO}_{4} + O_{2}$

$K_{2} {Cr}_{2} O_{7} + NaCl \overset{H^{+}}{\to} {Cl}_{2} + {Cr}^{+ 3}$

$I_{2} + conc . {HNO}_{3} \to {HIO}_{3} + {NO}_{2}$

answer is D.

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Detailed Solution

Potassium dichromate can't oxidises NaCl ,as potassium dichromate is sparingly soluble in water as compared to NaCl,hence the potassium dichromate separates out in the form of crystals,hence no oxidation is observed with NaCl.

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