The reaction, $3 MnO_{2}(s) + 4 Al(s) \longrightarrow 3 Mn(l) + 2 Al_{2}O_{3}(s) + \text{Heat}$, is an example of:

Which of the following statements is correct regarding the displacement reaction between copper and silver?

Write true or false for the following statement:
The reaction $Zn(s) + CuSO_4(aq) \longrightarrow ZnSO_4(aq) + Cu(s)$ is an example of a double displacement reaction.

Write two observations for the following chemical reaction:
$(a)$ Lead nitrate is strongly heated in a hard glass test tube.

If copper metal is heated over a flame, it develops a coating. What is the colour and composition of this coating?

Write a balanced chemical equation for each of the following reactions and also classify them.
$(a)$ Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.
$(b)$ $A$ piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.