Question

Assertion: A solution with $pH$ of 12 has a higher concentration of hydroxide ions than one with a $pH$ of 10.
Reason: $\left[H^{+}\right]\left[{OH}^{-}\right]$ must equal ${10}^{-14}$.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
• C. Assertion is true but Reason is false
• D. Assertion is false but Reason is true
• E. Both Assertion and Reason are false

Answer 1

The correct option is A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

$pH=-log\left[H^{+}\right]$
$pOH=-log\left[O{H}^{-}\right]$
$pH+pOH=14$
Hence, ${10}^{-14}=\left[H^{+}\right]\times \left[O{H}^{-}\right]$