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Questions  >>  JEEMAIN and NEET  >>  Chemistry  >>  Hydrogen
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$H_2$ gas is liberated when $H_2O_2$ reacts with

$\begin{array}{1 1}(a)\;\text{Acidified }KMNO_4\\(b)\;O_3\\(c)\;\text{Acidified }K_2Cr_2O_7\\(d)\;HCHO\end{array}$

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