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Which structure is linear?

1. SO₂
2. CO₂
3. CO₃²⁻
4. SO₄²⁻

Correct answer: CO₂

Solution

CO₂ is linear because it has a central carbon atom with two double bonds to oxygen atoms, resulting in a bond angle of 180° due to sp hybridization. The other molecules have different geometries due to lone pairs or multiple bonding groups.

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