Assertion (A): `pH` of `10^(8)M HCI` is not equal to `8`.
Reason (R) : `HCI` does not dissociate properly in very dilute solution.

Options

A. If both (A) and (R) are correc, and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If (A) is incorrect, but (R) is correct.

Answer

C

Explanation

Correct `(R)`: In such very dilute solutions both source of `H^(o+)` ions from `HCI` and `H_(2)O` mus be considered and due to common ion `(H^(o+))` supression of ionisation occurs.