Chemical formula for calcium pyrophosphate is $C a_{2} P_{2} O_{7}$ The formula for ferric pyrophosphate will be

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Solution

The correct option is C

Pyrophosphate ion is $P_{2} O_{7}^{4 -}$ and Ferric ion is $F e^{+ 3}$ . Therefore by criss - cross method the formula is $F e_{4} (P_{2} O_{7})_{3}$

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