Question

h2 molecule is more stable than h2+ ion

Answer 1

because they are bonded by covalent bond

Answer 2

Hope this will help ,  According to molecular orbital theory, H2+ has an unpaired electron in the bonding orbital. This is a higher energy state than H2, which has a pair of electrons in the bonding orbital. The lone electron in H2+ is known as a free radical. Free radicals attack other chemical bonds, and the H2+ molecule falls apart to bond with the newly separated atoms.