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In which of the following molecules/ions BF3, NO2−, NH2− and H2O, the central atom is sp2 hybridized?

1. NH2− and H2O
2. NO2− and H2O
3. BF3 and NO2−
4. NO2− and NH2−

Correct answer: BF3 and NO2−

Solution

In BF3, the boron atom forms three sigma bonds and has no lone pairs, resulting in sp2 hybridization. In NO2−, the nitrogen atom forms two sigma bonds and has one lone pair, also leading to sp2 hybridization.

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