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Ethers in contact with air for a long ti...

Ethers in contact with air for a long time form peroxides. The presence of peroxide in ether can be tested by adding `Fe^(2+)` ions in it and then

A

KCNS

B

`SnCl_(2)`

C

`HgCl_(2)`

D

Kl

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The correct Answer is:
A
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