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How many molecules have two lone pairs o...

How many molecules have two lone pairs on the central atom ?
`H_(2)O, SF_(4),I_(3)^(-),XeF_(5)^(-),XeOF_(4),PCl_(3),NCl_(3),ClF_(3),XeF_(2),NO_(2)^(-),CO_(3)^(2-)`

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The correct Answer is:
3
`H_(2)O, XeF_(3)^(-), CIF_(3)`
Ans is 3.
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How many molecules or ions have minimum tow lone pairs on the centre atom ? {:(H_(2)O,S_(4),I_(3)^(-),XeF_(3)^(-)),(XeF_(4),XeO_(2)F_(2),CIF_(3),NO_(3)^(-)):}

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