Question

Assertion :A solution with $pH=5$ has a higher concentration of hydronium ions than a solution with a $H=3$
Reason: $pH$ is defines as $-log\left[H^{+}\right]$

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

Answer 1

The correct option is C Assertion is incorrect but Reason is correct

A solution with $pH=5$ has a lower concentration of hydronium ions than a solution with a $pH=3$
pH is defines as $-lo{g}_{10}\left[H^{+}\right]$
For $pH=5$, $\left[H^{+}\right]={10}^{-pH}={10}^{-5}M$.
For $pH=3$, $\left[H^{+}\right]={10}^{-pH}={10}^{-3}M$.
${10}^{-5}M<{10}^{-3}M$