JEE Main levelSingle correct optionDifficulty 2 of 3el068
Why is a large excess of sodium hydrogencarbonate not recommended for relieving acidity?
AIt is a strong acid that damages the stomach lining
BIt blocks H2 receptors permanently
CIt makes the stomach alkaline and can trigger release of even more acid
DIt forms an insoluble precipitate with hydrochloric acid
Answer: C
Sodium hydrogencarbonate neutralises acid quickly, but an excess makes the stomach contents alkaline. This stimulates further release of hydrochloric acid, so the relief is temporary.