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Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryChemical Bonding and Molecular Structure2 Marks
Question
On the basis of VSEPR theory, predict the shapes of the following molecules and ions:
  1. $\text{PH}_3$
  2. $\text{NH}_3$
  3. $\text{NH}^-_2$
  4. $\text{H}_3\text{O}^+$
✓

Answer

  1. $\mathrm{PH}_3$ has 3 bond pairs, one lone pair, it has pyramidal shape.
  1. $\mathrm{NH}_3$ has 3 bond pairs and one lone pair, it has pyramidal shape.
  1. $\text{NH}^-_2$ has 2 bond pairs and 2 lone pairs, therefore, it has V-shape or bent molecule.
  1. $\text{H}_3\text{O}^+$ has 3 bond pairs and one lone pair, therefore, it is pyramidal.

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