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Find the number of planar molecules. {...

Find the number of planar molecules.
`{:((a),BF_(3),(b),BCl_(3)),((c),CO_(3)^(2-),(d),SO_(3)),((e),NH_(3),(f),NCl_(3)),((g),PCl_(3),(h),PF_(3)):}`

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The correct Answer is:
4
a, b, c d
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How many of the following have sp^(3) hydridisation around the central atom ? (a) H_(2)O , (b) CH_(3) , (c) BCl_(3) , (d) BF_(4)^(-) , (e) BeCl_(2)(g) (f) PCl_(4)^(+) , (g) XeF_(2) , (h) CO_(2) , (i) NH_(4)^(+) , (j) PCl_(3)

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