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How many molecules or ions have minimum ...

How many molecules or ions have minimum two lone pairs on the central atom ?
`{:(H_(2)O,SF_(4),I_(3)^(-),XeF_(5)^(-)),(XeF_(4),XeO_(2)F_(2),ClF_(3),NO_(3)^(-)):}`

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The correct Answer is:
5
`H_(2)O,I_(3)^(-),XeF_(5)^(-),XeF_(4),ClF_(3)`
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GRB PUBLICATION-CHEMICAL BONDING-I-Subjective Type
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  3. How many molecules or ions have minimum two lone pairs on the central ...

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  8. Find the total number of compounds or ions having different bond lengt...

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