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Question

Both CO2 and H2O contain polar covalent bonds but CO2 is non-polar while H2O is polar because:

A
H atom is smaller than C atom
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B
CO2 is a linear molecule while H2O is an angular molecule
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C
O-H bond is more polar than C-H bond
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D
CO2 contains multiple bonds while H2O has only single bonds
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Solution

The correct option is B CO2 is a linear molecule while H2O is an angular molecule
A polar covalent bond is an unequal sharing of electrons between two atoms with different electronegativities.
Both CO2 and H2O have two polar bonds. However the dipoles in the linear CO2 molecule cancel each other out, meaning that the CO2 molecule is non-polar.
H2O is planar but bent and the bond dipoles and unshared electron dipole moments do not sum to zero.

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