Which of the following statements is not correct?
- A$Mn_2O_7$ gives $HMnO_4$ on reaction with water.
- BOn heating,$AgNO_3$ gives $Ag$,$NO_2$,and $O_2$.
- C$V_2O_5$ is amphoteric and dissolves in alkalies to give $VO_4^{3-}$ ions.
- DAll of the above are incorrect.
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