Q.

The ionic conductance of the following cations in a given concentration are in the order

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a

Li+ < Na+ < K+ < Rb+

b

Li+ > Na+ > K+ > Rb+

c

Li+ < Na+ > K+ > Rb+

d

Li+ = Na+ < K+ < Rb+

answer is A.

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Detailed Solution

In a given concentration means aqueous solution.In aqueous solution Size of hydrated ions depends on degree of Hydration which inturn depends on size of cation.Degree of Hydration ∝1/size of ionSize of Hydrated ion ∝degree of HydrationLarger the size of hydrated ion lesser is the ionic mobility and lesser is the ionic conductance.
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