1. Tardigrade
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  3. Chemistry
  4. Assertion: H2 molecule is more stable than HeH molecule. Reason: The anti-bonding electron in the molecule destabilize it.

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Q. Assertion: $H_{2}$ molecule is more stable than $HeH$ molecule.
Reason: The anti-bonding electron in the molecule destabilize it.

AIIMSAIIMS 2011

Solution:

$H _{2}$ molecule is more stable than HeH because bond order of $H_{2}=1$
and that of $HeH =\frac{1}{2}$
(Higher the bond order, more is the stability).