1.

The charge /size ratio of cation determines its polarising power. Which one of the following sequences represents the increasing order of the polarising power of the cationic species, K^(+), Ca^(2+), Mg^(2+), Be^(2+)?

Answer»

`Ca^(2+)LTMG^(2+)ltBe^(2+)ltK^(+)`
`Mg^(2+)ltBe^(2+)ltK^(+)ltCa^(2+)`
`Be^(2+)ltK^(+)ltCa^(2+)ltMg^(2+)`
`K^(+)ltCa^(2+)ltMg^(2+)ltBe^(2+)`

Solution :High CHARGE and small size of the CATIONS INCREASES polarisation.
As the size of the given cations DECREASES as
`K^(+)gtCa^(2+)gtMg^(2+)gtBe^(2+)`
Hence polarising power is increases as
`K^(+)ltCa^(2)ltMg^(2+)ltBe^(2+)`


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