Assertion : Cr(VI) in the form of dichromate | vedclass

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(A) In $d$-block elements,the stability of the highest oxidation state increases down the group. $Cr(VI)$ is a strong oxidising agent because it is un

Vedclass · Accepted Answer

Both Assertion $\&$ Reason are True $\&$ the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) In $d$-block elements,the stability of the highest oxidation state increases down the group. $Cr(VI)$ is a strong oxidising agent because it is unstable and tends to get reduced to $Cr(III)$.Conversely,$Mo(VI)$ and $W(VI)$ are much more stable than $Cr(VI)$,which makes $MoO_3$ and $WO_3$ poor oxidising agents.Therefore,both the Assertion and the Reason are true,and the Reason correctly explains why $Cr(VI)$ acts as a strong oxidising agent while $Mo(VI)$ and $W(VI)$ do not.

Assertion : $Cr(VI)$ in the form of dichromate in acidic medium is a strong oxidising agent whereas $MoO_3$ and $WO_3$ are not.
Reason : $Mo(VI)$ and $W(VI)$ are found to be more stable than $Cr(VI)$.

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Assertion : $Cr(VI)$ in the form of dichromate in acidic medium is a strong oxidising agent whereas $MoO_3$ and $WO_3$ are not.Reason : $Mo(VI)$ and $W(VI)$ are found to be more stable than $Cr(VI)$.