Question: Give reason for the following : (a) Ionic compounds have higher melting point and higher boiling point. (b) Sodium is kept immersed in kerosene. (c)

Give reason for the following :
(a) Ionic compounds have higher melting point and higher boiling point.
(b) Sodium is kept immersed in kerosene.
(c) Reaction of calcium with water is less violent.
(d) Silver articles become black after some time when exposed to air.
(e) Prior to reduction the metal sulphides and carbonates must be converted into metal oxides for extracting metals.

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