Give reason for the following:
(a) ionic compounds have higher melting point and higher boiling point.
(b) Sodium is kept immersed in kerosene.
reaction of calcium with water is less violent
silver articles become black after some time when exposed to air.
Prior to reduction the metal sulphides and carbonates must be converted
into metal oxides for extracting metals.
Answers
(a) Ionic compounds have higher melting and boiling points because the intermolecular forces of attraction is very high and to break it high amount is energy is required.
(b) Sodium is kept immersed in kerosene because it is highly reactive to water. It can even cause high energy release of placed in water.
(c) The heat produced in the reaction is not enough to burn the hydrogen gas produced. Hence this is less violent.
(d) Silver articles become black after sometime when exposed to air because it forms silver oxide in the presence of air, which is black in colour.
(e) Metal sulphides and carbonates cannot be reduced directly to the constituent metal. Hence to reduce it into the metal, it should be converted to its oxide at first.
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