Assertion : $P H$ of a buffer solution does not change on dilution. Reason: On dilution, the ratio of concentration of salt and acid (or base) remains unchanged.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Buffer solution is combination of salt of weak acid/base.
For example, $p H$ of salt of weak acid strong base is:
$p H = p k_{a} + \frac{[s a l t]}{[a c i d]} \to (c o n c e n t r a t i o n r a t i o)$
On dilution, ratio doesn't changes.
$∴$ Reason is also correct and is the correct explanation.

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Assertion :PH of a buffer solution does not change on dilution. Reason: On dilution, the ratio of concentration of salt and acid (or base) remains unchanged.

Assertion : $P H$ of a buffer solution does not change on dilution. Reason: On dilution, the ratio of concentration of salt and acid (or base) remains unchanged.