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In which of these molecules is the H-X-H bond angle the largest?

1. NH3
2. H2O
3. PH3
4. CH4

Correct answer: CH4

Solution

CH4 has no lone pairs and a perfect tetrahedral angle of 109.5 deg, which is larger than NH3 (107 deg), H2O (104.5 deg), and PH3 (about 93.5 deg).

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