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CBSE Class 12-science Answered

The emf of the cell, cu(s) /cu+2(aq, 1M||Ag+(aq, 0.1M) /Ag(s)  is x volt. When the cocentration of anode and cathode are interchanged then emf of the cell becomes y volt. Select the correct option among the following.  1) x greater than y 2) x less than y 3) x=y 4) y=0 and a greater than 0
Asked by Shobhsuresh2341 | 01 May, 2019, 02:23: PM
answered-by-expert Expert Answer
Half reactrions can be written as-
 
A t space A n o d e minus C u rightwards arrow C u to the power of plus 2 end exponent plus 2 e to the power of minus space space A t space c a t h o d e space minus A g to the power of plus space plus e to the power of minus space rightwards arrow A g space space space c o m p l e t e space c e l l space r e a c t i o n space minus C u plus 2 A g to the power of plus space rightwards arrow C u to the power of plus 2 end exponent plus 2 A g Q equals fraction numerator left square bracket C u to the power of plus 2 end exponent right square bracket over denominator left square bracket A g to the power of plus right square bracket squared end fraction Q equals fraction numerator 1 over denominator 0.1 cross times 0.1 end fraction equals 100 e l e c d r o d e space p o t e n t i a l space a c c o r d i n g space t o space N e r n s t space e q u a t i o n x equals negative. fraction numerator.0591 over denominator 2 end fraction ln left parenthesis 100 right parenthesis space space space space space horizontal ellipsis left parenthesis 1 right parenthesis W h e n space c o n c e n t r a t i o n space o f space space a n o d e space a n d space c a t h o d e space a r e space e x c h a n g e d space T h e n comma space Q equals fraction numerator 0.1 cross times 0.1 over denominator 1 end fraction equals 1 over 100 y equals negative fraction numerator 0.0591 over denominator 2 end fraction ln left parenthesis 1 over 100 right parenthesis space space space space space space horizontal ellipsis left parenthesis 2 right parenthesis y o u space c a n space s e e space f r o m space e q u a t i o n space left parenthesis 1 right parenthesis space a n d space left parenthesis 2 right parenthesis comma space space y space i s space g r e a t e r space t h a n space x
Answered by Ravi | 02 May, 2019, 03:56: PM
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