The presence of peroxides in old samples of ethers is detected by shaking them with a freshly prepared solution of $F e^{2 +} (F e S O_{4})$ followed by the addition of KCNS. The appearance of ______ colour indicates the presence of peroxides.

Blue

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Green

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Red

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Brown

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Solution

The correct option is C Red
The appearance of Red. colour indicates the presence of peroxides.

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F e^{2 +}

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