Question

Assertion :pH of a solution changes from 6 to 7 when diluted by 10 times Reason: If $\left[H^{+}\right]$ decreases 10 times, pH increases by one unit

• 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 correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

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

$pH=-{\log }_{10}\left[H^{+}\right]$
So, if $\left[H^{+}\right]$ decreases 10 times, pH increases by one unit.
An acid always has pH less than 7, irrespective of number of times it is diluted