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Question

Difference in the oxidation number of chromium in Cr2O3 and K2Cr2O7 :

A
5
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B
3
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C
2
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D
1
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Solution

The correct option is B 3
Let the oxidation number of Cr in K2Cr2O7 is x. Hence, 2×1+2×x+(2)×7=0.
So x = +6
Similarly for Cr2O3 ,
2×x+3×(2)=O
So x = +3
Hence, the difference is 3.

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