A pink colored salt on dry heating becomes blue in colour. Salt may contain 

  • A

    $Cu^{2+}$

  • B

    $Fe^{2+}$

  • C

    $Zn^{2+}$

  • D

    $Co^{2+}$

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Which of the following statements are correct about $Zn,\,Cd$ and $Hg$ ?

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