Complete and balance the following chemical equations:
(i) Al₂O₃ + HCl ?
(ii) K₂O + H₂O ?
(iii) Fe + H₂O ?
(b) An element ‘X’ displaces iron from the aqueous solution of iron sulphate. List your observations if the element ‘X’ is treated with the aqueous solutions of copper sulphate, zinc sulphate and silver nitrate. Based on the observations arrange X, Zn, Cu and Ag in increasing order of their reactivities.

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