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 \[\text{N}{{\text{a}}_{\text{4}}}{{\text{P}}_{\text{2}}}{{\text{O}}_{\text{7}}}\text{.}\]It is sodium salt of pyrophosphoric acid \[\text{(}{{\text{H}}_{4}}{{\text{P}}_{2}}{{\text{O}}_{7}}\text{),}\] which may be considered to be made up by two molecules ofortho hosphoric acid \[({{H}_{3}}P{{O}_{4}}),\] eleminating one molecule of \[{{H}_{2}}O.\] \[2{{H}_{3}}P{{O}_{4}}\xrightarrow{-{{H}_{2}}O}\underset{\begin{smallmatrix} \text{Pyrophosphoric} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{acid} \end{smallmatrix}}{\mathop{{{H}_{4}}{{P}_{2}}{{O}_{7}}}}\,\] \[\underset{\text{Sodium}\,\text{pyrophosphate}}{\mathop{O\leftarrow \underset{Na}{\overset{Na}{\mathop{\underset{|}{\overset{|}{\mathop{\underset{O}{\overset{O}{\mathop{\underset{|}{\overset{|}{\mathop{P}}}\,}}}\,}}}\,}}}\,-O-\underset{Na}{\overset{Na}{\mathop{\underset{|}{\overset{|}{\mathop{\underset{O}{\overset{O}{\mathop{\underset{|}{\overset{|}{\mathop{P}}}\,}}}\,}}}\,}}}\,\to O}}\,\]
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