What type of oxide is phosphorus pentoxide $(P_4O_{10})$?

Name a non-metal which is lustrous and a metal which is non-lustrous.

What is formed when sodium absorbs moisture from air? Give the chemical equation as well.

$(i)$ Define the term 'anode mud'. Name the electrode made of pure metal.
$(ii)$ Give the reactions taking place at cathode and at anode during the electrolytic refining of copper.

What is the molecular formula of sodium aluminate?

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.