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Q.

An acidic solution of dichromate is electrolyzed for 8 minutes using 2A current. As per the following equation

Cr 2 O 7 2− +14 H + +6 e − →2 Cr 3+ +7 H 2 O  .The amount of C r 3+   obtained was 0.104 g. The efficiency of the process (in %) is (Take: F=96000C,   Atomic mass of Chromium=52)

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answer is 60.

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Detailed Solution

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Charge (Q)=It=2×8×60=960C ⇒96096000=0.01F 
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Theoretical mass of 
C r 3+ = 1 3 × 960 96000 ×52=0.173g   So, efficiency = W actual  W Theoritical  ×100= 0.104 0.173 ×100=60%    

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