A. calcium sulphate
B. phosphoric sulphate
C. Calcium sulphate
D. None of these
Explanation:
Bone ash is a white material produced by the calcination of bones. Typical bone ash consists of about 55.82% calcium oxide, 42.39% phosphorus pentoxide, and 1.79% water. The exact composition of these compounds varies depending upon the type of bones being used, but generally, the formula for bone ash is: Ca5(OH)(PO4)3.