Washing Soda

Q. What happens chemically when baking soda is heated? Give chemical equation also.

Q. Identify the reactants in the following reaction.

$\text{KOH(aq)}+{\text{HNO}}_3\text{(aq)}\to {\text{H}}_2\text{O(l)}+{\text{KNO}}_3\text{(aq)}$

1. ${\text{H}}_2\text{O}$, ${\text{KNO}}_3$
2. ${\text{HNO}}_3$, ${\text{H}}_2\text{O}$
3. $\text{KOH}$, ${\text{HNO}}_3$
4. ${\text{KNO}}_3$, $\text{KOH}$