Question

Assertion : Solubilities of alkali metal fluorides and carbonates increase down the group.
Reason : Hydration energies of alkali metal halides decrease down the group with increase in size of cations.
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 reason is not the correct explanation of the assertion
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer 1

Correct Answer - b
Both statements are correct but reason is not the correct explanation of assertion.
Assertion `:` The reason for this is that their lattice energy and hydration energy both decrease down the group, change in lattice energy is more than the hydration energy.
Reason `:` Hydration energy `prop (1)/("size of cation")`