#2015_16 Contribution to "Chemistry on Brilliant"-1

Which of the following is not correct:

$(A)$ $[{ H }^{ + }]=[{ OH }^{ - }]=\sqrt { { K }_{ w } }$ for a neutral solution at all temperatures.

$(B)$ $[{ H }^{ + }]=[{ OH }^{ - }]={ 10 }^{ -7 }$ for a neutral solution at all temperatures.

$(C)$ $[{ H }^{ + }]>\sqrt { { K }_{ w } }$ and $[{ OH }^{ - }]<\sqrt { { K }_{ w } }$ for an acidic solution.

$(D)$ $[{ H }^{ + }]<\sqrt { { K }_{ w } }$ and $[{ OH }^{ - }]>\sqrt { { K }_{ w } }$ for an alkaline soluton.