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# Decomposition of $H_2O_2$ is prevented by adding

$\begin{array}{1 1}(a)\;NaOH\\(b)\;MnO_2\\(c)\;\text{Acetanilide}\\(d)\;\text{Carbon powder}\end{array}$

Acetanilide is a negative catalyst for decomposition of $H_2O_2$
Hence (c) is the correct answer.