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Solution

(i) Solid, because ionic bonds are stronger than any other bond as they have high electrostatic force between the two oppositely charged ions.
(ii) Low, because they have weak intermolecular forces between the molecules.
(iii) The general formula for alkane is C_nH_2n+2.
(iv) For alkynes the general formula is C_nH_2n-2.

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