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The elements
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a
2
b
3
c
4
d
5
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Correct option is C
B forms BF4−, C forms CH4 and N forms NH4+.Oxygen can show maximum covalence 3 only as in H3O+.Similar Questions
Statement-I: Boron does not form [BF6]3-.
Statement-II: Boron does not have d - subshell in its valence shell.
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