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Question

Explain why:
(a) covalent compounds have generally high melting points.
(b) ionic compounds have generally high melting points.


Solution

(a) Covalent compounds are made up of electrically neutral molecules. So the force of attraction between the molecules is very weak. Only a small amount of heat energy is required to break these weak molecular forces, due to which covalent compounds have a low melting point.
(b) Ionic compounds have generally high melting points because ionic compounds are composed of positively and negatively charged ions. So there is a strong force of attraction between these ions. A large amount of heat energy is required to break this strong force of attraction and hence they have a high melting point.

Science
Lakhmir Chemistry 2013
Standard X

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