1.

Assertion: The melting and boiling points of the alkali metals are low. Reason: Alkali metals have weak metalli bonding.

Answer»

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false.

Solution :Alkali metals have weak METALLIC bonding DUE to the presence of only a SINGLE VALENCE electron in them.


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