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The emf of the cell M|M(NO3)x(0.01M)||M(NO3)x(0.1M)|M is found to be 0.0197 V at standard conditions. The valency of the metal in the metal nitrate is 
 


Solution

M(s)+Mx+M(s)+Mx+0.1M0.01M
At standard conditions, 2.303RTF=0.0591
Ecell=E0.0591x log 0.010.100.0591xlog0.010.1=0.0197 Vx=3
E°is 0 because it is a concentration cell.
 

Chemistry

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