Which of the following is an oxide of metal?

Compound $X$ and aluminium are used to join railway tracks.
$(a)$ Identify the compound $X$.
$(b)$ Name the reaction.
$(c)$ Write down its chemical reaction.

State what happens when zinc granules are heated with sodium hydroxide solution. Write the balanced equation for this reaction. Name the main product formed in this reaction.

Which gas is produced when a base reacts with a metal?

Which metal reacts with cold water violently?

Which non-metal element is used in the vulcanization of rubber?