Question

10. Assertion: Lithium has maximum degree of hydration, more stable.
Reason: The hydration enthalpy of alkali metal ions decreases with
Increase in ionic sizes.
a. A and R both are correct, A is correct explanation of R.
b. A and R both are correct, A is not correct explanation of R.
c. A is false, R is true.
d. A is true, R is false.
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Answer 1

A and R both are correct, A is the correct explanation of R.

Answer 2

✨Here’s your answer✨

Lithium is the smallest in size among the alkali metals. Hence, Li +ion can polarize water molecules more easily than other alkali metals. As a result, water molecules get attached to lithium salts as water of crystallization.
Hence, lithium salts such as trihydrated lithium chloride (LiC1.3H20) are commonly hydrated. As the size of the ions increases, their polarizing power decreases. Thus hydration enthalpies decreases.Hence, other alkali metal ions usually form anhydrous salts.

Hence both Assertion and Reason are correct also Reason is correct explanation for Assertion.

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