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When a metal chloride MCI is dissolced i...

When a metal chloride `MCI` is dissolced in a large excess of ammonia, practially all metal can be assumed to exist as `M_(x)(NH_(3))_(y)^(+x)`. Find the value of `x +y` using the following two cells.

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The correct Answer is:
3
`M|underset((10^(-4)M))(MCI),underset((1M))(NH_(3))||underset((10^(-2)M))(MCI),underset((1M))(NH_(3))|M`
`E_(cell) = 0.118V` at 298,
`M|underset((10^(-3)M))(MCI),underset((1M))(NH_(3))||underset((10^(-3)M))(MCI),underset((0.1M))(NH_(3))|M`
`E_(cell) = 0.12V` at 298K
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