1.

The formula of sodium pyrophosphate is

A.  \[N{{a}_{2}}{{P}_{2}}{{O}_{7}}\]                
B.  \[N{{a}_{3}}P{{O}_{4}}\]
C.  \[N{{a}_{4}}{{P}_{2}}{{O}_{7}}\]              
D.         \[N{{a}_{3}}P{{O}_{3}}\]
Answer» D.         \[N{{a}_{3}}P{{O}_{3}}\]


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