Assertion :An aq. soln. of $N H_{3}$ is a weak base and a weak electrolyte. Reason: Ammonia is a weak base and it combines with acids to form salts. With HCl it reacts to form ammonium chloride. 99.4% os ammonia molecules are protonated but does not completely ionize so it is a weak base and electrolyte.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Ammonia is a weak base and it combines with acids to form salts. With HCl it reacts to form ammonium chloride. 99.4% os ammonia molecules are protonated but does not completely ionize so it is a weak base and electrolyte.

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Assertion (A) All collision of reactant molecules lead to product formation.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

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Assertion :An aq. soln. of NH3 is a weak base and a weak electrolyte. Reason: Ammonia is a weak base and it combines with acids to form salts. With HCl it reacts to form ammonium chloride. 99.4% os ammonia molecules are protonated but does not completely ionize so it is a weak base and electrolyte.