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JEE Main · 2023 · 30 Jan 2023 · Shift 2 · Chemistry in Everyday Life

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Given below are two statements : One is labelled as Assertion A and the other labelled as Reason R.
Assertion A: Antihistamines do not affect the secretion of acid in stomach.
Reason R : Antiallergic and antacid drugs work on different receptors.
In the light of the above statements, choose the correct answer from the options given below:
  1. (A)A is false but R is true
  2. (B)Both A and R are true and R is the correct explanation of A✓ Correct
  3. (C)A is true but R is false
  4. (D)Both A and R are true but R is not the correct explanation of A.

Answer: (B)

Solution

Histamine acts through two different receptors: allergic responses are mediated by receptors and the secretion of acid in the stomach by receptors. An ordinary antihistamine taken against allergy blocks only the receptor and so leaves the -controlled secretion of stomach acid untouched. The assertion that such antihistamines do not affect acid secretion is therefore true, and the reason, that the antiallergic and the acid-controlling drugs act on different receptors, is both true and the correct explanation of the assertion.

JEE Main · 2023 · 30 Jan 2023 · Shift 2 · Single correct option

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