Q.

Fluorex is a special mixture of

A. di-calcium phosphate and carbon
B. tri-calcium phosphate and hydroxyapatite
C. di-calcium phosphate and phosphoric acid
D. tri-calcium phosphate and carbon
Answer» B. tri-calcium phosphate and hydroxyapatite
Explanation: fluorex is used for removing fluoride and it is a special mixture of tri- calcium phosphate and hydroxyapatite. it is used as a filter medium.
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