Correct order of oxidising nature is

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(A) The oxidising nature of the trioxides of group $6$ elements depends on the stability of the lower oxidation states. As we move down the group from

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$CrO_3 > MoO_3 > WO_3$

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(A) The oxidising nature of the trioxides of group $6$ elements depends on the stability of the lower oxidation states. As we move down the group from $Cr$ to $W$,the stability of the $+6$ oxidation state increases,while the stability of lower oxidation states decreases. Therefore,$CrO_3$ is a strong oxidising agent because $Cr$ prefers to be in the $+3$ oxidation state. In contrast,$MoO_3$ and $WO_3$ are much less oxidising because $Mo$ and $W$ are more stable in the $+6$ oxidation state. The correct order of oxidising nature is $CrO_3 > MoO_3 > WO_3$.

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