Question

Consider the following statements:
(I) `Li^(+) (aq)` is greater in size than `Cs^(+) (aq)`
(II) `H - F` is more thermal stable than HI.
maleic acid is more acidic than fumaric acid.
The correct statements are -
A. I and III
B. II alone
C. I and II
D. I, II and III

Answer 1

Correct Answer - D
(i) Size in aqueous medium `prop` hydration energy
hydration energy `prop (1)/("size of cation")`
(ii) `H - F " " H - 1`
`1s - 2p " " 1s - 5 p`
strength order `1s - 2p gt 1s - 5 p` so thermal stablity of `HF gt HI`