The polyatomic ion known as the diphosphate ion is an important intermediate formed in metabolic processes. If the ionic compound calcium diphosphate has the formula Ca 2P 2O 7, which of the following correctly represents the symbol for the diphosphate ion?A) P2O74−
B) P2O714−
C) PO4+
D) P2O72−
E) PO2−
Answers: 3
is formed by the combination of calcium ions 
and diphosphate ions 
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