Even through carbon and silicon are non metals, they have higher melting points than others because :

they exist as covalent solids in 3D networks

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the bonds in their molecules are strong

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they exhibit multiple bonding

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they are highly electronegative

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Solution

The correct option is A they exist as covalent solids in 3D networks
Even through carbon and silicon are non metals, they have higher melting points than others because they exist as covalent solids in 3D networks. Thus there is large association of atoms of C and Si and large amount of energy is required to break this association.

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(i) Carbon has the ability to form covalent bonds with other atoms of carbon giving rise to a large number of molecules through a self-linking property.

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(a) Metal nitrates are highly unstable

(b) Metal nitrates are highly soluble in water

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