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Alkali metals are soft and have low melting point and boiling point due to

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Inter atomic bonds are weak

Inter atomic bonds are strong

Low ionization potential

Smaller atomic size

answer is A.

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Detailed Solution

All the alkali metals have large size and have low density which increases down the group from Li to Cs. Because of large size, the inter atomic bonds within alkali metals is weak. They are silvery white, soft and light metals.

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