What do you mean by a precipitation reaction?

Explain oxidation and reduction in terms of gain or loss of oxygen. Mention examples for each one. 

What type of chemical reaction is respiration? 

Balance the following chemical equations:

(a) $\mathrm{Na}+{\mathrm{O}}_2\to {\mathrm{Na}}_2\mathrm{O}$

(b) $\mathrm{K}+{\mathrm{H}}_2\mathrm{O}\to \mathrm{KOH}+{\mathrm{H}}_2$

Explain oxidation and reduction in terms of gain or loss of oxygen. Mention one example for each one. 

The chemical reaction $\mathrm{Fe}+{\mathrm{CuSO}}_4\to {\mathrm{FeSO}}_4+\mathrm{Cu}$ is which type of reaction?

Balance the following chemical equations:

(a) ${\mathrm{H}}_2+{\mathrm{O}}_2\to {\mathrm{H}}_2\mathrm{O}$

(b) ${\mathrm{MnO}}_2+\mathrm{HCl}\to {\mathrm{MnCl}}_2+{\mathrm{Cl}}_2+{\mathrm{H}}_2\mathrm{O}$

The reaction of water with $\mathrm{CaO}$ has been shown in the given diagram. 

(a) Write the names of $\left[1\right]$ and $\left[2\right]$. 

(b) Write the name of the reaction taking place.

(c) Write the balanced equation for the reaction taking place.