Assertion : Solution of Na_2CrO_4 in water is | vedclass

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(B) The $Na_2CrO_4$ salt contains the chromate ion,$CrO_4^{2-}$.In $CrO_4^{2-}$,the oxidation state of $Cr$ is $+VI$,which means its electronic config

Vedclass · Accepted Answer

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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(B) The $Na_2CrO_4$ salt contains the chromate ion,$CrO_4^{2-}$.In $CrO_4^{2-}$,the oxidation state of $Cr$ is $+VI$,which means its electronic configuration is $[Ar] 3d^0$.Since there are no $d-$electrons,$d-d$ transitions are not possible.The intense yellow colour of $Na_2CrO_4$ is due to charge transfer from oxygen to the metal $(Cr)$ atom.Therefore,both the Assertion and the Reason are correct,but the Reason is not the correct explanation for the colour,as the colour arises from charge transfer,not the oxidation state itself.

Assertion : Solution of $Na_2CrO_4$ in water is intensely coloured.
Reason : Oxidation state of $Cr$ in $Na_2CrO_4$ is $+VI$.

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Assertion : Solution of $Na_2CrO_4$ in water is intensely coloured.Reason : Oxidation state of $Cr$ in $Na_2CrO_4$ is $+VI$.