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Railways PYQCBT 1 2020

RRB NTPC · Question 40

A solution reacts with chalk powder to give a gas that turns lime-water milky. The solution contains:

  1. AlCl_3

  2. MgCl_2

  3. NaCl

  4. HCl

Show answer & explanation

Answer: (D) HCl

Explanation

Chalk is calcium carbonate. Hydrochloric acid reacts with it to give carbon dioxide, which turns lime-water milky.