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KCET2020ChemistryChemical Bonding and Molecular Structure

Bond angle is PH ₄⁺ is more than that of PH ₃ . This is because

Options

  1. Alone pair - bond pair repulsion exists in PH ₃
  2. BPH ₄⁺ has square planar structure
  3. CPH ₃ has planar trigonal structure
  4. Dhybridisation of P changes when PH ₃ is converted to PH ₄⁺

Correct answer

A. lone pair - bond pair repulsion exists in PH ₃

Step-by-step solution

Bond angle of PH ₄⁺ is more than that of PH ₃ as in PH ₃ due to greater lone pair-bond pair repulsions than the bond pair-bond pair repulsions, the tetrahedral angle decreases from 109^ 28^ to 93.6^ and has a pyramidal structure. In PH ₄⁺ , there are four bond pairs and no lone pair and due to the absence of lone pair-bond pair repulsions and presence of four identical bond pair-bond pair interactions PH ₄⁺ has tetrahedral geometry with bond angle 109^ .

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