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Correct statement among the following is

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$K M n O_{4}$ can be decolorized by oxalic acid at a greater rate at low temperature than at high temperature

Combustion of methane is an instantaneous reaction

Formation of water from $H_{(a q)}^{+}$ and $O H_{(a q)}^{-}$ is a fast reaction

Deuterium reacts fast with chlorine than when compared to hydrogen reacting with chlorine

answer is C.

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Detailed Solution

The KMnO₄converted into the Mn²⁺ which act as the auto catalyst. Initially the KMnO₄ is first converted into ${MnO}_{4}^{-}$ which makes the reaction slow after that when it is converted into Mn²⁺ then makes the reaction faster.

Combustion of methane is a slow reaction.

The reaction between hydrogen and chlorine is about 14 times faster than between deuterium and chlorine.

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