Assertion: Water acts as a base when ammonia is dissolved in it.
Reason: Ammonia yields ammonium hydroxide in aqueous solutions.

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

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

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Assertion is true but Reason is false

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Assertion is false but Reason is true

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Both Assertion and Reason are false

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In aqueous solution, ammonia acts as a base, acquiring hydrogen ions from $H_{2} O$ to yield ammonium and hydroxide ions.
$N H_{3} (a q) + H_{2} O (l) \to N H_{4}^{+} (a q) + O H^{-} (a q .)$

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Assertion: Water acts as a base when ammonia is dissolved in it.Reason: Ammonia yields ammonium hydroxide in aqueous solutions.

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion In aqueous solution, ammonia acts as a base, acquiring hydrogen ions from H2O to yield ammonium and hydroxide ions.NH3(aq)+H2O(l)→NH+4(aq)+OH−(aq.)

Assertion: Water acts as a base when ammonia is dissolved in it.
Reason: Ammonia yields ammonium hydroxide in aqueous solutions.