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Q.

The bond lengths and bond angles in the molecules of methane, ammonia and water are given below
Question ImageQuestion ImageQuestion Image
The variation in bond angle is a result of
i) The increasing repulsion between H atoms as the bond length decreases
ii) The number of non bonding electron pairs in the molecule
iii) A non bonding electron pair having a greater repulsive force than a bonding electron pair

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a

i, ii & iii are correct

b

i &ii are only correct

c

ii & iii are only correct

d

only i is correct

answer is C.

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Detailed Solution

Question Image

As the no.of lone pairs increases repulsive forces between L.P-B.P & L.P increases
i.e.. L.P causes more repulsions on the B.P's and hence B.P electrons moving closer to each other, therefore B.A decreases order of
Repulsion between different electron pairs
B.P-B.P < B.P-L.P < L.P-L.P Since lone pair occupies more space as compared  to B.P

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The bond lengths and bond angles in the molecules of methane, ammonia and water are given below The variation in bond angle is a result of i) The increasing repulsion between H atoms as the bond length decreases ii) The number of non bonding electron pairs in the molecule iii) A non bonding electron pair having a greater repulsive force than a bonding electron pair