Question

Compound P reacts with hydrochloric acid to produce a gas that turns limewater milky

What is P?

A) Sodium Carbonate
B) Sodium chloride
C) Sodium hydroxide
D) Sodium sulfate

Answer 1

Answer:

a) sodium carbonate

Explanation:

Answer 2

We can solve this problem by option elimination method.

Option C is No doubt not the appropriate answer because we would get Sodium Chloride and water as the product which do not cause lime water to become milky white. It is neutralisation reaction!!!

Option B and D form Chlorine gas and sulfur dioxide gas respectively which too are not responsible for the whitening of lime water.

Option A forms $CO_2$ responsible for whitening of lime water. Thus this the answer.

Answer: Option A