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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
Structure of ammonia is
  • A
    Trigonal
  • B
    Tetrahedral
  • ✓
    Trigonal pyramidal
  • D
    Pyramidal
✓

Answer

Correct option: C.
Trigonal pyramidal
c
By looking at the Lewis structure of an ammonia $\left( NH _3\right)$ molecule, shape of an ammonia molecule is described by trigonal pyramidal structure. The $N$ atom in ammonia is $sp ^3$ hybridized as it has one lone pair of electrons and three bond pairs of electrons. This results in tetrahedral electron pair geometry and Trigonal pyramidal molecular geometry.

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