Decomposition of $H_{2} O_{2}$ is prevented by adding:

N a O H

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M n O_{2}

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acetanilide

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carbon powder

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Solution

The correct option is C acetanilide
Substances like Urea, Sodium Stannate, Acetanilide or Sodium Pyrophosphate act as negative catalysts in the decomposition of hydrogen peroxide.
On the other hand, substances like Silica, Manganese Dioxide, Iron, Manganese or Alumina cause rapid decomposition.

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