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Chemical Bonding and Molecular Structure question

2016 · Q104
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Chemical Bonding and Molecular Structure question

2016 · Q104

NEETChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
Consider the molecules CH4, NH3 and H2O.

Which of the given statements is false?
  1. A
    The H −-− O −-− H bond angle in H2O is smaller than the H −-− N −-− H bond angle in NH3.
  2. B
    The H −-− C −-− H bond angle in CH4 is larger than the H −-− N −-− H bond angle in NH3.
  3. C
    The H −-− C −-− H bond angle in CH4, the H −-− N −-− H bond angle in NH3, and the H −-− O −-− H bond angle in H2O are all greater than 90o.
  4. D
    The H −-− O −-− H bond angle in H2O is larger than the H −-− C −-− H bond angle in CH4.
View written solutionFree

Correct answer: D

NEET 2016 Phase 1 Chemistry - Chemical Bonding and Molecular Structure Question 107 English Explanation


In CH4, there is no lone pair of electrons so it is perfectly tetrahedral in shape and has H-C-H bond angle of 109°28′ but in NH3 there is one lone pair which due to more repulsion with bond pairs of electrons pushes them more closer thus bond angle decreases to 107°. In H2O, there are two lone pair of electrons which suppress the bond angle more to 104.5°.
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