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Question

In acidic medium, dichromatic ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 g, its gram equivalent weight (in grams) is :

A
24.5
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B
49
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C
125
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D
250
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Solution

The correct option is D 49
Cr2O27+14H++6Fe2+2Cr3++6Fe3++7H2O
During the reaction, the oxidation number of Cr decreases from +6 to +3. Net decrease in the oxidation number of one Cr atom is 63=3. For 2 Cr atoms (in dichromate ion), the total decrease in the oxidation number is 2×3=6
The gram equivalent weight =gram molecular weight Total change in the oxidation number=2946=49

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