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State whether the following statements about molecular shapes and electron pair repulsion are True (T) or False (F): (a) The order of repulsion between different pairs of electrons follows: lone pair-lone pair > lone pair-bond pair > bond pair-bond pair. (b) As the number of lone pairs on the central atom increases, the bond angle generally increases from the standard value. (c) The oxygen atom in H2O has 2 lone pairs, while the nitrogen atom in NH3 has 1 lone pair. (d) The shapes of xenon fluorides and xenon oxyfluorides cannot be accounted for using VSEPR theory.

1. TTTF
2. TFTF
3. TFTT
4. TFFF

Correct answer: TFTF

Solution

Statement (a) is True. (b) is False — more lone pairs decrease bond angles. (c) is True (O has 2 LP, N has 1 LP). (d) is False — VSEPR theory does explain the shapes of xenon fluorides and oxyfluorides.

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