$A$ compound $X$ is a constituent of baking powder. It is used as an antacid. When $X$ is heated, it releases a gas $Y$ which, when passed through lime water, turns it milky, and a salt $Z$ is formed, which is the main constituent of washing powder. Identify $X, Y$, and $Z$. Write balanced chemical equations for the reactions involved.
- A$X = NaHCO_3, Y = CO_2, Z = Na_2CO_3$
- B$X = Na_2CO_3, Y = CO_2, Z = NaHCO_3$
- C$X = NaHCO_3, Y = CO, Z = Na_2CO_3$
- D$X = Na_2CO_3, Y = CO_2, Z = NaOH$
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