MCQ
Which one is incorrect :
- A$Zn + dil. HNO_3 \to Zn(NO_3)_2 + N_2O$
- B$Zn + conc. HNO_3 \to Zn(NO_3)_2 + NO_2$
- C$Zn + very dil. HNO_3 \to Zn(NO_3)_2 + NH_4NO_3$
- ✓$Cu + dil. HNO_3 \to Cu(NO_3)_2 + N_2O$
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$(I)$ $H_5P_3O_{10}$ $(II)$ $H_6 P_4O_{13}$
$(III)$ $H_5P_5O_{15}$ $(IV)$ $H_7P_5O_{16}$
non-cyclic phosphates are