A) \[N{{a}_{2}}{{P}_{2}}{{O}_{4}}\]
B) \[N{{a}_{4}}{{P}_{2}}{{O}_{5}}\]
C) \[N{{a}_{4}}{{P}_{2}}{{O}_{7}}\]
D) \[N{{a}_{2}}{{P}_{2}}{{O}_{5}}\]
Correct Answer: C
Solution :
Sodium pyrophosphate is represented by \[N{{a}_{4}}{{P}_{2}}{{O}_{7}}\]. 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\[({{H}_{3}}P{{O}_{4}}),\]eleminating one molecule of\[{{H}_{2}}O\]. \[2{{H}_{3}}P{{O}_{4}}\xrightarrow[{}]{-{{H}_{2}}O}\underset{Pyrophosphoric\text{ }acid}{\mathop{{{H}_{4}}{{P}_{2}}{{O}_{7}}}}\,\] \[\underset{Sodium\text{ }pyrophosphate}{\mathop{O\leftarrow \underset{\begin{align} & | \\ & O \\ & | \\ & Na \\ \end{align}}{\overset{\begin{align} & Na \\ & | \\ & O \\ & | \\ \end{align}}{\mathop{P}}}\,-O-\underset{\begin{align} & | \\ & O \\ & | \\ & Na \\ \end{align}}{\overset{\begin{align} & Na \\ & | \\ & O \\ & | \\ \end{align}}{\mathop{P}}}\,\to O}}\,\]
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