Bronze is an alloy of:

$A$ metal $A$,which is used in the thermite process,when heated with oxygen gives an oxide $B$,which is amphoteric in nature. Identify $A$ and $B$. Write down the reactions of oxide $B$ with $HCl$ and $NaOH$.

What will happen when:
$(i)$ Magnesium is treated with very dilute nitric acid?
$(ii)$ Steam is passed over red hot iron?

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

Write equations for the reactions of:
$(i)$ Iron with steam
$(ii)$ Calcium and potassium with water

What is thermit reaction? How is it used to join the railway tracks or cracked machine parts?