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Q.

An effective antacid contains:

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a

Sodium hydroxide

b

Magnesium hydroxide

c

Sour milk

d

Lime water

answer is B.

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Detailed Solution

Concept: An antacid neutralizes the digestive acidity. An antacid reduces the amount of acid in our stomach. A base is necessary to neutralise the acid.
For acidity in the stomach, a drug called antacid is used. To neutralize an acid, a base is required. In the given options sodium and magnesium hydroxides are basic. Sour milk contains lactic acid and lime water contains citric acid. Acidic options can be neglected.
In the remaining options, sodium hydroxide is too strong and buffering is difficult. Thus magnesium hydroxide is effective as an antacid. The reaction with acid in the digestive system is given below;

M g (O H) 2 + 2 H C l → M g C l 2 + 2 H 2 O

Thus, magnesium hydroxide is the correct answer.
Hence, the correct answer is option 2.

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