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Question

Which of the following are non-polar?


A
SiF4
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B
XeF4
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C
SF4
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D
BF3
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Solution

The correct options are
A $$SiF_4$$
B $$XeF_4$$
D $$BF_3$$
$$XeF_4$$ has two lone pairs on $$Xe$$ (two lone pairs on opposite cancel the dipoles)and is nonpolar.
Even though in $$SF_4$$ all the four $$F$$ atoms dipoles are cancelled by each other there is a lone pair on $$S$$ , hence it is polar.
$$SiF_4$$,$$XeF_4$$,$$BF_3$$
all the dipoles are cancelled each other, so non-polar.
Hence options A,B & D are correct.

Chemistry

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