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Question

The formula of the compound formed by the combination of Cr3+ and F− ions is

A
Cr3F
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B
CrF
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C
Cr3F3
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D
CrF3
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Solution

The correct option is D CrF3
The balancing of an ionic compound is done in such a manner that there is no charge on the molecule as a whole .Thus, one Cr3+ will combine with three F− to form CrF3

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