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AIIMS 2017
Exam
AIIMS
Year
2017
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

AIIMS 2017 · Chemistry · Chemical Bonding and Molecular Structure

H_2 O is polar, whereas BeF_2 is not because

H2O\mathrm{H}_2 \mathrm{O} is polar, whereas BeF2\mathrm{BeF}_2 is not becauseH_2 O is polar, whereas BeF_2 is not because

Options

  1. Aelectronegativity of F\mathrm{F} is greater than that of O\mathrm{O}
  2. BH2O\mathrm{H}_2 \mathrm{O} involves H\mathrm{H}-bonding, whereas BeF2\mathrm{BeF}_2 is a discrete molecule
  3. CH2O\mathrm{H}_2 \mathrm{O} is angular and BeF2\mathrm{BeF}_2 is linear
  4. DH2O\mathrm{H}_2 \mathrm{O} is linear and BeF2\mathrm{BeF}_2 is angular.

Correct answer

C. H2O\mathrm{H}_2 \mathrm{O} is angular and BeF2\mathrm{BeF}_2 is linear

Step-by-step solution

Because of linear shape, dipole moments cancel each other in BeF2( F=BeσF)\mathrm{BeF}_2(\mathrm{~F}=\mathrm{Be} \sigma \mathrm{F}) and thus, it is non-polar, whereas H2O\mathrm{H}_2 \mathrm{O} is V\mathrm{V}-shaped and hence, it is polar. H_2 O is polar, whereas BeF_2 is not because
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