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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:
4
` r(NH_(4)^(+))//r(Br^(-)) ` = 143/196 = 0.730. Which lis in the range 0.414 - 0.732. Hence , coordination number = 6
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