A-LevelChemistryChemical bonding9701/12 · Oct/Nov 2023 · Q71 Mark

Two compounds of boron are sodium borohydride, NaBH4, and boron trifluoride, BF3. What are the shapes of the borohydride ion and the boron trifluoride molecule?

Asquare planar, pyramidal

Bsquare planar, trigonal planar

Ctetrahedral, pyramidal

Dtetrahedral, trigonal planar

✓ Correct answer

D: tetrahedral, trigonal planar

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Topic: Chemical bonding, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 7.

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