Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Among the alkali metals, lithium salts exhibit the least electrical conductance in aqueous solutions. Reason: Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.A) If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
C) If Assertion: is true but Reason: is false
D) If both Assertion: and Reason: are false
Correct Answer: C
Solution :
Hydration energy varies inversely with size. Hence, as we move from Li to Cs, size of alkali metals increases and thus, hydration energy decreases. Thus, lithium ion being smallest in size among alkali metals, is most extensively hydrated and becomes largest in size. Thus, it has least electrical conductivity among alkali metals. \[KOH\]
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