Sodium pyrophosphate is represented by which of the following formula

1.	Sodium pyrophosphate is represented by which of the following formula
Answer» `Na_(2)P_(2)O_(4)` `Na_(4)P_(2)O_(5)` `Na_(4)P_(2)O_(7)` `Na_(2)P_(2)O_(5)` SOLUTION :Sodium pyrophosphate is represented by `Na_(4)P_(2)O_(7)`.It is sodium salt of pyrophosphoric acid `(H_(4)P_(2)O_(7))`,which may be considered to be made up by two molecules of ORTHO phosphoric acid `(H_(3)PO_(4))`eliminating one molecule of `H_(2)O`. `2H_(3)PO_(4) underset("Pyrophosphoric acid")(overset(-H_(2)O)toH_(4)P_(2)O_(7)"")` `underset("Sodium pyrophosphate")(O larr underset(NA)underset(\|)underset(O)underset(\|)overset(Na)overset(\|)overset(O)overset(\|)P-O-underset(Na)underset(\|)underset(O)underset(\|)overset(Na)overset(\|)overset(O)overset(\|)P RARRO)`

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