Assertion :pH of pure water is always 7. Reason: Pure water contains equal concentrations of hydronium and hydroxyl ions at room temperature.

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 D Assertion is incorrect but Reason is correct.
pH is dependent on the concentration of $H^{+}$ only, which varies with temperature as the extent of dissociation of water is temperature dependent. pH of pure water is 7 at $25^{0} C$ .

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Choose the correct option.

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Assertion :pH of pure water is always 7. Reason: Pure water contains equal concentrations of hydronium and hydroxyl ions at room temperature.

The correct option is D Assertion is incorrect but Reason is correct.pH is dependent on the concentration of H+ only, which varies with temperature as the extent of dissociation of water is temperature dependent. pH of pure water is 7 at 250C.

The correct option is D Assertion is incorrect but Reason is correct.
pH is dependent on the concentration of $H^{+}$ only, which varies with temperature as the extent of dissociation of water is temperature dependent. pH of pure water is 7 at $25^{0} C$ .