Select the $CORRECT$ order of stability.

  • A
    $Hg^{+2} > Hg$
  • B
    $Sn^{+4} > Sn^{+2}$
  • C
    $Bi^{+5} > Bi^{+3}$
  • D
    $PbBr_4 > PbCl_4$

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Write the stock notation name of $SnO_2$.

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Variable valency is shown by

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