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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3el208

Which of the following statements are correct?

  1. ACimetidine lowers acid output by blocking H2 receptors, whereas antacids only neutralise acid already present.
  2. BOfloxacin is a narrow-spectrum antibiotic effective only against one type of bacteria.
  3. CBrompheniramine blocks H1 receptors and does not stop acid secretion in the stomach.
  4. DBecause of its anti-blood-clotting action, aspirin is used to lower the risk of heart attack.

Answer: A, C, D

Antihistamines such as brompheniramine act at H1 receptors in allergy, and acid release is controlled through H2 receptors, which cimetidine blocks. Aspirin reduces clotting and so helps prevent heart attacks. Ofloxacin is a broad-spectrum antibiotic, so statement 4 is false.
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