Which of the following is an example for intra-molecular redox reaction?

(NH₄)₂Cr₂O₇ → N₂ + Cr₂O₃ + 4 H₂O

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P₄ + 3 NaOH + 3 H₂O → PH₃ + 3 NaH₂PO₂

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Ag²⁺ + Ag → 2 Ag⁺⁺

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2FeCl₂ + 2HCl + H₂O₂ → 2FeCl₃ + 2H₂O

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Solution

The correct option is A (NH₄)₂Cr₂O₇ → N₂ + Cr₂O₃ + 4 H₂O
Two atoms $^{'} N^{'}$ and $^{'} C r^{'}$ show a change in oxidation number from the same molecule and hence this is an example for intra molecular redox reaction.

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