Which among the following is not redox reaction?

C a + H_{2} \to C a H_{2}

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P_{4} \to P H_{3} + H_{2} P O_{2}^{-}

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F e C l_{3} + K_{4} [F e (C N)_{6}] \to K F e [F e (C N)_{6}] + K C l

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C_{2} H_{5} O H + O_{2} \to C O_{2} + H_{2} O

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Solution

The correct option is B $F e C l_{3} + K_{4} [F e (C N)_{6}] \to K F e [F e (C N)_{6}] + K C l$
The reaction $F e C l_{3} + K_{4} [F e (C N)_{6}] \to K F e [F e (C N)_{6}] + K C l$ is a double displacement reaction.
It is not a redox reaction as there is no change in the oxidation number.

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