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Question

If acidified solution of K2Cr2O7 turns green on addition of a salt then salt may contain :

A
Fe2+
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B
K+
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C
Mn2+
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D
H+
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E
None
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Solution

The correct option is A Fe2+
In acidic medium, Fe2+ is oxidized to Fe3+ and Cr2O27 is reduced to chromate. Henc, the colour changes from orange to green.

6Fe2++Cr2O27+14H+6Fe3++2Cr3+(green)+7H2O

Thus, the given statement, "If acidified solution of K2Cr2O7 turns green on addition of a salt then salt may contain Fe2+." is true.

Hence, option A is correct.

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