Discussion
'X' is a chemical present in our stomach and is necessary for digestion of food. When 'X' is secreted in excess, it causes health problems like indigestion. 'Y' is a chemical used to treat this condition. What could be 'X' and 'Y' ?
Answer: C
X is hydrochloric acid and Y is milk of magnesia.
The stomach secretes hydrochloric acid, which creates the acidic medium needed for the enzyme pepsin to digest proteins and also kills germs. Too much acid causes acidity and indigestion. It is treated with an antacid, a mild base such as milk of magnesia (magnesium hydroxide), which neutralises the excess acid.
Milk of magnesia is not secreted in the stomach, so options naming it as X are wrong. Sodium carbonate (washing soda) is too strongly alkaline to take as an antacid; the antacid in that family is sodium hydrogencarbonate (baking soda). Ascorbic acid, vitamin C, is an acid and would make acidity worse.
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