1.

One litre solution of MgCl_(2) is electrolyzed completely by passing a current of 1A for 16 min 5 sec.The ogiginal concentration of MgCl_(2) solution was(Atomic mass of Mg=24)

Answer»

`5 xx 10^(-3)` M
`5 xx 10^(-2)` M
`0.5 xx 10^(-3)` M
`1.0 xx 10^(-2)` M

Solution :(a) : Current = 1 A, TIME = 16 min 5 sec = 965 sec Quantity of electricity passed = current `xx` time
= 1 `xx` 965
= 965 C
w = ZIt(where w= amount of substance deposited)
`w = (12)/(96500) xx 965 ( :' Z = (E)/(96500)) = (12)/(100)`
Conc. of `MgCl_(2) = ("Weight")/("Mol.mass" xx V(L)) = (12)/(100xx24xx1)`
`= 1/(200) = 5 xx 10^(-3)` M


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