In the form of dichromate, $\ce{Cr(VI)}$ is a strong oxidising agent in acidic medium but $\ce{Mo (VI)}$ in $\ce{MoO_3}$ and $\ce{W(VI)}$ in $\ce{WO_3}$ are not because $.........$
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In the groups of $d-$block element higher oxidation states are favourable by heavier element.
For example, in group $6, \ce{Mo(VI)}$ and $\ce{W(VI)}$ are found to be more stable than $\ce{Cr(VI)}.$
Thus $\ce{Cr(VI)}$ in the form of dichromate in acidic medium is a strong oxidising agent.
where, as $\ce{MoO_3}$ and $\ce{WO_3}$ are not.
For example, in group $6, \ce{Mo(VI)}$ and $\ce{W(VI)}$ are found to be more stable than $\ce{Cr(VI)}.$
Thus $\ce{Cr(VI)}$ in the form of dichromate in acidic medium is a strong oxidising agent.
where, as $\ce{MoO_3}$ and $\ce{WO_3}$ are not.
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