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Three litres of 0.5M K(2)Cr(2)O(7) solut...

Three litres of 0.5M `K_(2)Cr_(2)O_(7)` solution have to completely reduced in the acidic medium. The number of faraday of electricity required will be ….

Text Solution

Verified by Experts

The correct Answer is:
9
The reaction is `Cr_(2)O_(7)^(2-) + 14H^(+) + 6e^(-) rarr 2Cr^(3+) + 7H_(2)O`
For 1mol, 6 F is required
Given that molarity = 0.5M, so number of moles = molarity `xx` volume (in L) `=0.5 xx 3= 1.5` mol. For 1.5 mol, the quantity of electricity required is `1.5 xx 6= 9F`
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