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 pyrophos-phoric acid \[({{H}_{4}}{{P}_{2}}{{O}_{7}}),\]which may be considered to be made up by two molecules of orthro phosphoric acid \[({{H}_{3}}P{{O}_{4}}),\]eliminating one molecule of\[{{H}_{2}}O\]. \[2{{H}_{3}}P{{O}_{4}}\xrightarrow{-{{H}_{2}}O}\underset{\text{Pyrophoshoric}\,\,\text{acid}}{\mathop{{{H}_{4}}{{P}_{2}}{{O}_{7}}}}\,\] \[\underset{\text{Sodium}\,\,\text{pyrophosphate}}{\mathop{O\leftarrow \underset{Na}{\overset{Na}{\mathop{\underset{|}{\overset{|}{\mathop{\underset{O}{\overset{O}{\mathop{\underset{|}{\overset{|}{\mathop{P}}}\,}}}\,}}}\,}}}\,--O--\underset{Na}{\overset{Na}{\mathop{\underset{|}{\overset{|}{\mathop{\underset{O}{\overset{O}{\mathop{\underset{|}{\overset{|}{\mathop{P}}}\,}}}\,}}}\,}}}\,\to O}}\,\]
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