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ICSE Class 10 Chemistry Question 6 of 22

Solved 2024 Question Paper ICSE Class 10 Chemistry — Question 14

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14
Question

Question 1(xiv)

In the molecule of water, oxygen atom has:

  1. One shared pair of electrons.
  2. Three shared pairs of electrons.
  3. Two lone pairs of electrons.
  4. One lone pair of electrons
Answer

Two lone pairs of electrons

Reason — Water contains two hydrogen atoms and one oxygen atom. The hydrogen atom [1] has one electron in it's valence shell while the oxygen atom [2, 6] has 6 electrons in it's valence shell. Two hydrogen atom share one electron each and two unshared pairs of electrons are left as lone pairs as shown in the diagram below :

State why water has two lone pairs of electrons in it's covalent molecule while ammonia has one lone pair. Chemical Bonding, Simplified Chemistry Dalal Solutions ICSE Class 9