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Which of the following do not contain fluorine ?

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Which of the following do not contain fluorine ?
A. Fluorspar
B. Cryolite
C. Fluorapatite
D. Carnallite
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Correct Answer - D
Carnallite = KCl, `MgCl_2 . 6H_2O` where as fluorspar : `CaF_2`, Cryolite : `Na_3AlF_6`, fluorapatite : `3Ca_3(PO_4)_2CaF_2`
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