Assertion :If an acid is added to water with original pH of $7$ , the concentration of hydroxide ions will increase. Reason: The product of hydroxide ions and hydrogen ions is equal to $1.0 \times$ $10^{- 14}$ in all aqueous solutions at $25^{o}$ C.

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

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Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

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The Assertion is correct and the Reason is incorrect

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The Assertion is incorrect but the Reason is correct

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Solution

The correct option is D The Assertion is incorrect but the Reason is correct
When an acid is added to water, the concentration of $H^{+}$ or hydrogen ions increases due to which $p H$ decrease. Hence the assertion is incorrect.

At $25^{o} C$ in all aqueous solution solution, $[H^{+}] \times [O H^{-}] = 10^{- 14}$
Hence, the reason is correct.

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Assertion :If an acid is added to water with original pH of 7, the concentration of hydroxide ions will increase. Reason: The product of hydroxide ions and hydrogen ions is equal to 1.0× 10−14 in all aqueous solutions at 25oC.

Assertion :If an acid is added to water with original pH of $7$ , the concentration of hydroxide ions will increase. Reason: The product of hydroxide ions and hydrogen ions is equal to $1.0 \times$ $10^{- 14}$ in all aqueous solutions at $25^{o}$ C.