1.

5 litre solution of 0.4M CuSO_((aq)) is electrolysed using Cu electrode. A currentof 482.5 ampere of passed for 4 minute. The concentrations of CuSO_4 left in solution is

Answer»

0.16 M
0.32 M
0.34 M
0.40 M

Solution :LET us suppose `K_1` and `K_2` are the SPECIFIC conductance of solutions 'A' and 'B' REPECTIVELY and CELL constant is 'y'. We know that, Specific conductance = Conductance `xx` Cell constant
(A), `k_1` = `1/50xxy`For (B), `k_2` = `1/100xxy`
When EQUAL volume of (A) and (B) are mixed, the volume becomes double. then,
Specific conductance of mixture = `(k_1+k_2)/2`
`:. (k_1 + k_2)/2=1/Rxxy``1/2[y/50+y/100]=1/Rxxy`
`1/100+1/200=1/R`
R=`200//3`=66.66 ohm


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