Alkali metals are not characterized by :

good conductor of heat and electricity

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high oxidation potentials

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high melting points

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solubility in liquid ammonia

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Solution

The correct option is C high melting points
The physical and chemical properties of the alkali metals can be explained by their having an $n s^{1}$ valence electronic configuration which results in weak metallic bonding. Hence all alkali metals are soft and have a low melting point.

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[M (N H_{3})_{n}]^{+}

M =

[M (N H_{3})_{n}]^{+}

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