Question

Assertion :A solution with a pH of $12$ has a higher concentration of hydroxide ions than a solution with a pH of 10 Reason: At ${25}^{o}C$, pH + pOH = $14$.

• A. Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion
• B. Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion
• C. The Assertion is correct and the Reason is incorrect
• D. The Assertion is incorrect and the Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion

As pH increases, the number of hydroxide ions increases.

Also pH +pOH =14 at ${25}^{0}C$.

Thus, if the pH increases, the concentration of the $\left[H^{+}\right]$ ion decreases and the concentration of the $\left[O{H}^{-}\right]$ ion increases.