Which ions are responsible for the chemical properties of bases in their aqueous solution?

$A$ 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.

On what basis are acids classified as strong and weak acids?

How does the acidity of an acidic aqueous solution change as the concentration of $[H_{3}O^{+}]$ decreases?

Write true or false for the following statement:
Mixing an acid or base with water results in an increase in the concentration of ions $(H_{3}O^{+} / OH^{-})$ per unit volume.

Which of the following is an oxide of metal?