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According to Molecular orbital theory, a molecule of $H_{2}$ has two electrons in

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$σ_{1 s}$

$σ *_{2 s}$

$σ_{2 s}$

$σ *_{1 s}$

answer is A.

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Detailed Solution

  σ*1s
    □

1s ↑ ↑ 1s
H atom H atom

  σ1s
 ↑↓

This represents the Molecular Orbital (MO) diagram of H₂ molecule.

Two 1s atomic orbitals from H atoms combine to form:
- Bonding orbital (σ1s) → filled with 2 electrons (↑↓)
- Antibonding orbital (σ*1s) → empty

Bond order = (Nb – Na)/2 = (2 – 0)/2 = 1 → H₂ is stable with a single bond.

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