Which of the following is not correct

  • A

    $Mn_2O_7$ gives $H_2MnO_4$ on reaction with water

  • B

    on heating $AgNO_3$ gives $Ag_2O$ and $NO_2$

  • C

    $V_2O_5$ gives $VO_4^{ -1}$ and $VO_4^{+3}$ on reaction with alkalies

  • D

    All are incorrect

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