State whether the following statement is true or false:
Calcium oxide is also called lime or quicklime.

$(a)$ Balance the chemical equation:
$Fe(s) + H_2O(g) \rightarrow Fe_3O_4(s) + H_2(g)$
$(b)$ Identify the type of reaction in the equation given below:
$Na_2SO_4(aq) + BaCl_2(aq) \rightarrow BaSO_4(s) + NaCl(aq)$

What happens when a piece of $(i)$ Silver metal is added to copper sulphate solution? Also,write the balanced chemical equation if the reaction occurs.

State what happens when:
$(a)$ Chlorine gas is passed through dry slaked lime.
Also write the chemical equation in each case.

Define a chemical equation. What is an unbalanced chemical equation called?

State whether the following statement is true or false:
On heating lead nitrate crystals, the emission of brown fumes occurs.