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(A): Lithium reacts with water more vigo...

(A): Lithium reacts with water more vigorously than sodium
(R): Lithium possesses small size and very high hydration energy
The correct answer is 

A

(A) is correct but (R) is not correct

B

(A) is not correct but (R) is correct

C

Both (A) and (R ) are correct and (R) is the correct explanation of (A)

D

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Text Solution

Verified by Experts

The correct Answer is:
B
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Solubility depends on the lattice energy of the solid and the hydration energy of the ions. Some lattice values for Group - II compounds are much lighter than the values for Group - I compounds, because of the effect of the increased charge on the ions in the Boron - Lande equation. Taking any one particular negative ion the lattice energy decreases as the size of the metal increases. The hydration energy also decreases as the metal ions become larger. For a substance to dissolve, the hydration energy must exceed thelattice energy The correct order of solubility is