1.

Assertion:H_(2) molecule is more stable than HEH molecule. Reason: the anti-bonding electron in the molecule destabilise it.

Answer»

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

Solution :`H_(2)` molecule is more stable than `HEH` because BOND order `H_(2)=1`
ad that of `HeH=(1)/(2)`
(HIGHER the bond order, more is the STABILITY).


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