Question

(a) Define the term alloy. Write two advantages of making alloys.

(b) A metal 'X' which is used in thermite process, when heated with oxygen gives an oxide'Y which is amphoteric in nature. Identify X and Y. Write down balanced chemical equations of the reactions of oxide Y with HCI and NaOH.

Answer 1

(a) Refer to the question No.

Advantages :

(i) to protect the metal from corrosion.

(ii) to improve the quality.

(b) X - Al; Y- Al₂O₃

Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O

Al₂O₃ + 2NaOH → 2NaAlO₂ + H₂