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Assertion Ammonia is a base. Reason Ammonia when dissolved in water takes up proton to form ammonium and furnishes \( \boldsymbol{O H}^{-} \) ions.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Correct answer: Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Solution

Ammonia acts as a base because it accepts a proton from water, producing ammonium ions. This process also generates hydroxide ions, which is exactly why the assertion is true and the reason correctly explains it.

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