What is the oxidation number of $Li$ in $Li_2O$?

  • A
    $+1$
  • B
    $+2$
  • C
    $-1$
  • D
    $-2$

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Sulphur in $+3$ oxidation state is present in

In which of the following does phosphorus have an oxidation state of $+3$?

Consider the following compounds:
$\underline{K}O_2$,$H_2\underline{O}_2$ and $H_2\underline{S}O_4$.
The oxidation states of the underlined elements in them are,respectively,

Calculate the oxidation number of phosphorus in the following species:
$(a)$ $HPO_3^{2-}$
$(b)$ $PO_4^{3-}$

The oxidation state of iodine in $I_3^{-}$ is:

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