Assertion : Solution of Na_2CrO_4 in water is | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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.

Vedclass · Answer

(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 $+VI$.

Similar Questions

The conductivity and appearance of $CrO_2$ are like metallic $Cu$.

Which of the following alloys is used in the construction of the outer fuselage of ultra-high-speed aircraft?

Calomel is the name of

When $MnO_2$ is fused with solid $KOH$ in the presence of air,what is the product formed and its color?

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
$(i)$ iodide
$(ii)$ iron $(II)$ solution and
$(iii)$ $H_{2}S$

Vedclass Test Series

Exam Paper Generator

Online Exam Module

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