Assertion (A): Sodium hydrogencarbonate is an ingredient in antacids.
Reason (R): Sodium hydrogencarbonate is a neutral salt.

(a) Both A and R are true and R is correct explanation of the Assertion.
(b) Both A and R are true but R is not the correct explanation of the Assertion.
(c) A is true but R is false.
(d )A is false but R is true.
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Solution

Correct option is (c) i.e. A is true but R is false.
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Sodium hydrogencarbonate is a basic salt that is not neutral. It has a pH of around 9.

During indigestion, excess acid $HCl$ is produced in our stomach, which causes pain and irritation.

Antacids are mild bases that can be ingested when we suffer from indigestion. The excess stomach acid can be neutralised using a mild base.
Antacids are made up of mild bases such as magnesium hydroxide, aluminium hydroxide, sodium bicarbonate, etc. These react with the hydrochloric acid produced in the stomach, neutralising it and relieving pain.

Hence, A is true but R is false.

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