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NH(4)^(+) and Br^(-) ions have ionic of...

`NH_(4)^(+) and Br^(-)` ions have ionic of 143 pm and 196 pm respecitvely. The coordination number of ` NH_(4)^(+)` ion in ` NH_(4)Br` is

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The correct Answer is:
6
`r_(NH_4^+)//r_(Br^-)`=143/196=0.730 which lies in the range 0.414-0.732 . Hence, coordination number =6.
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