Diamond is a covalent compound, yet has a high melting point. Explain.

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Solution

It is the bonding between the carbon atoms in diamond because of which it is hard and has high melting point. In diamond, each carbon atom is bonded to four other carbon by sigma bonds, forming a rigid three dimensional structure, which means very high amount of energy is required to break the bonds and hence results in high melting point.

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Explain the following :

(a) Electrovalent compounds conduct electricity in molten or aqueous state.

(b) Electrovalent compounds have a high melting point and boiling point while covalent compounds have low melting and boiling points.

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