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ChemistryInteger+3Question 32 of 60

JEE Advanced 2014 · Paper 1, Chemistry question 32

A list of species having the formula XZX4\ce{XZ4} is given below.

XeFX4\ce{XeF4}, SFX4\ce{SF4}, SiFX4\ce{SiF4}, BFX4X−\ce{BF4-}, BrFX4X−\ce{BrF4-}, [Cu(NHX3)X4]X2+\ce{[Cu(NH3)4]^{2+}}, [FeClX4]X2−\ce{[FeCl4]^{2-}}, [CoClX4]X2−\ce{[CoCl4]^{2-}} and [PtClX4]X2−\ce{[PtCl4]^{2-}}.

Defining shape on the basis of the location of X and Z atoms, the total number of species having a square planar shape is

Answer and worked solution

Official answer: 4

Square planar.

  • XeFX4\ce{XeF4}: 4 bonds + 2 lone pairs, octahedral arrangement. Square planar.
  • BrFX4X−\ce{BrF4-}: 4 bonds + 2 lone pairs. Square planar.
  • [Cu(NHX3)X4]X2+\ce{[Cu(NH3)4]^{2+}}: d9d^9, dsp² type. Square planar.
  • [PtClX4]X2−\ce{[PtCl4]^{2-}}: d8d^8 with a strong field (5d). Square planar.

Not square planar. SFX4\ce{SF4} (see-saw); SiFX4\ce{SiF4} and BFX4X−\ce{BF4-} (tetrahedral); [FeClX4]X2−\ce{[FeCl4]^{2-}} and [CoClX4]X2−\ce{[CoCl4]^{2-}} (tetrahedral, weak-field chloride).

Answer: 4

Topics:VSEPR theoryValence bond theory
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