The sequence of ionic mobility in aqueous solution isa)K+ Na+ Rb+ Cs+b)Cs+ Rb+ K+Na+c)Rb+ K+ Cs+ Na+d)Na+ K+Rb+Cs+Correct answer is option 'B'. Can you explain this answer?

Question

The sequence of ionic mobility in aqueous solution isa)K+> Na+> Rb+> Cs+b)Cs+> Rb+> K+>Na+c)Rb+> K+> Cs+> Na+d)Na+> K+>Rb+>Cs+Correct answer is option 'B'. Can you explain this answer?

Answer

Smaller the size of cation, higher will be the hydration and its effective size will increase and hence mobility in aqueous solution will decrease. Larger size ions have more ionic mobility due to less hydration. Thus the degree of hydration of M⁺ ions decreases from Li⁺ to Cs⁺. Consequently the radii of the hydrated ion decreases from Li⁺ to Cs⁺. Hence the ionic conductance of these hydrated ions increases from Li⁺ to Cs⁺

Answer

The sequence of ionic mobility in aqueous solution is:

1. Li+
2. Na+
3. K+
4. Rb+
5. Cs+

This sequence is based on the size and charge of the ions. Smaller ions with higher charge have higher mobility because they have less resistance to movement through the solution. However, the sequence can be affected by other factors such as the concentration and temperature of the solution.

Answer

Smaller the size greater will be the mobility ,
BUT IN AQUEOUS STATE,
greater the size greater will be the mobility
so size is Li< />< />< />< />< />
therefore it will be Cs >Rb>K>Na

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