Question

Assertion :A solution with $pH=5$ has a higher concentration of hydronium ions than one with $pH=3$. Reason: $pH$ is defined 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

Since $-{log}_{10}\left[H^{+}\right]=pH$

or $Say\Rightarrow pH\alpha \frac{1}{\left[H^{+}\right]}$

So when $H^{+}$ is larger $\Rightarrow$ $pH$ is smaller.