Extinguishing fire - class-VIII

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Multiple Choice

A white solid $X$ reacts with dil.$HCl$ to give colourless gas which is used in fire extinguishers. The solid $X$ is:

  1. $NaCl$
  2. $CH _2COONa$
  3. $Na _2CO _3$
  4. $NaHCO _3$
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