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The alkali metals have relatively low melting point.

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The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point?

(a) Li

(b) Na

(c) K

(d) Rb

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(a) Li

Li has small size due to which it possess high ionisation energy also its binding energy in its crystal lattice is very high. That's why lithium has high melting point.

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