In which reaction does $\mathrm{HNO_3}$ not behave as an oxidising agent?
- A$\mathrm{I_2+10HNO_3\rightarrow2HIO_3+10NO_2+4H_2O}$
- B$\mathrm{3Cu+8HNO_3\rightarrow3Cu(NO_3)_2+2NO+4H_2O}$
- C$\mathrm{4Zn+10HNO_3\rightarrow4Zn(NO_3)_2+NH_4NO_3+3H_2O}$
- D$\mathrm{2HNO_3+P_2O_5\rightarrow2HPO_3+N_2O_5}$
✓ Correct answer: D
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