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In which of the following species the angle around the central atom is exactly equal to 109°28′ :
A
SF₄
B
NH₃
C
NH₄⁺
D
None of the above
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The bond angle in H₂O molecule is less than that of NH₃ molecule because:

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The bond angles of NH₂⁻, NH₃, and NH₄⁺ are in the order:

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