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Which of the following molecule has tetrahedral geometry?

  • A.\(\mathrm{SF_{6}}\)
  • B.\(\mathrm{PCl_{5}}\)
  • C.\(\mathrm{BF_{3}}\)
  • D.\(\mathrm{BeCl_{2}}\)
  • E.\(\mathrm{NH_{4}^{+}}\)

Answer: E

The tetrahedral species is NH4+.

In the ammonium ion, nitrogen has four bond pairs and no lone pair, so it is sp3 hybridised and regular tetrahedral with bond angles of 109.5°.

The others have different shapes: SF6 is octahedral, PCl5 trigonal bipyramidal, BF3 trigonal planar and BeCl2 linear.

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