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Question

Which of the following has the highest bond angle?


A

H2O

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B

H2S

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C

NH3

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D

PH3

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Solution

The correct option is C

NH3


The explanation for the correct answer

(C) NH3

  • The angle between two covalent bonds that originate from the same atom is called the Bond angle.
  • The Bond angle decreases down the group.
  • NH3have 3bonding pair and 1lone pair. Nis more electronegative, Nattracts the shared pair of electrons.
  • It experiences a strong repulsion due to electron-electron repulsion force.
  • So, NH3has the highest bond angle.

Hence, Option (C) NH3is correct.

The explanation for the incorrect answer

(A) H2O

  • Bond angle decreases down the group
  • Thus, H2O has a greater bond angle than H2S
  • The lone pair-lone pair repulsion on oxygen is more effective.
  • Hence, H2O has a lesser bond angle thanNH3.

(B) H2S

  • Bond angle decreases down the group
  • Thus, H2S has a lesser bond angle than H2O

(D) PH3

  • Pis less electronegative than N
  • It cannot attract shared pair of electrons effectively.
  • So PH3has a lesser bond angle than NH3

Therefore, Option (C) NH3is correct.


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