Question

(i) Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
(ii) Ionic compounds have generally high melting points.
(iii) Hydrogen is not a metal but is has been assigned a place in the reactivity series of metals.
(iv) The galvanised iron article is protected against rusting even if the zinc layer is broken.

Answer 1

(i) It is easy to reduce metal oxide to the metallic form than metal carbonate or metal sulphide.
(ii) In ionic compounds, oppositely charged ions are closely packed and the attractive forces are very strong. Therefore, ionic compounds have high melting points.
(iii) Hydrogen has been assigned a place in the reactivity series of metals because just like metals, it behaves as an electropositive element.