For pure water,

Options

A. Both pH and pOH decrease with increase in temperature.
B. Both pH and pOH increase with increase in temperature.
C. pH decreases and pOH increases with increase in temperature.
D. pH increases and pOH decreases with increase in temperature.

Answer

D

Explanation

With increase in temperature the ionisation of `H_(2)O` increases and hence the `[H ^(o+)] and [overset(o+)(OH)]` increases. Therefore, pH and pOH decreases with increases of temperature.