Rock phosphate has chemical composition

A. (CaO)₃, P₂O₅

B. Ca₃(PO₄)₂

C. Ca₃PO₄

D. CaCO₃

Answer: Option B

Solution(By Examveda Team)

Rock phosphate has a chemical composition Ca₃(PO₄)₂.
It is a calcium salt of phosphoric acid with the chemical formula Ca₃(PO₄)₂. It is also known as tribasic calcium phosphate (TCP) and bone phosphate of lime (BPL).
The molar mass of the compound is 310.18, and appears as a white amorphous powder with low solubility.
It exists as three crystalline polymorphs α, α′, and β. The α and α′ states are stable at high temperatures.