AIIMS 2018 Chemistry Acid Reactions Assertion Reason Question
When is titrated with then at neutral point the color of phenolphthalein becomes colorless from pink:
Due to formation of
Due to formation of which acts as a weak acid
Because phenolphthalein vaporizes.
Due to presence of
Correct Answer
Detailed Explanation
Option B is correct because both the assertion and reason are true: the reaction of formic acid (HCOOH) with sulfuric acid (H₂SO₄) does produce carbon monoxide (CO) and water (H₂O), and sulfuric acid acts as a dehydrating agent. However, the reason provided does not directly explain why the reaction produces CO, as the formation of CO is primarily due to the dehydration of formic acid rather than its mild oxidizing properties.
Option A is incorrect because, while both statements are true, the reason does not adequately explain the assertion. Options C and D are incorrect as they misrepresent the truth of the assertion and reason, respectively.
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