What is the melting point of alumina $(Al_2O_3)$ (in $;K$)?

What is an ore of iron?

By which method is aluminum metal obtained by the reduction of alumina?

What is the percentage of $H_{2}SO_{4}$ in dilute sulfuric acid (in $\%$)?

Which metal exists in a liquid state at room temperature?

Give reasons for the following:
$(i)$ Carbon can reduce zinc oxide to zinc but not calcium oxide to calcium.
$(ii)$ Copper and aluminium wires are usually used for electricity transmission.