K(2)Cr(2)O(7)//H^(+) changes to green by...

`K_(2)Cr_(2)O_(7)//H^(+)` changes to green by

`Fe^(2+)`

`SO_(2)`

Both (a) and (b)

None of the above

Verified by Experts

The correct Answer is:

D-BLOCK ELEMENTS
ARIHANT PUBLICATION|Exercise Part II Questions for Assessment (Very short answer type questions)|4 Videos
D-BLOCK ELEMENTS
ARIHANT PUBLICATION|Exercise Part II Questions for Assessment (Short answer type I questions)|4 Videos
D-BLOCK ELEMENTS
ARIHANT PUBLICATION|Exercise Part II Question for practice ( Long answer type questions)|1 Videos
COORDINATION COMPOUNDS
ARIHANT PUBLICATION|Exercise CHAPTER PRACTICE Long Answer Type Questions 7 MARKS|6 Videos
ELECTROCHEMISTRY
ARIHANT PUBLICATION|Exercise CHAPTER PRACTICE ( LONG ANSWER TYPE QUESTIONS) |3 Videos

The colour of K_2Cr_2O_7 changes from redorange to lemon yellow on treatment with KOH(aq.) because of :

Reduction of Cr (vi) to Cr (III)

Formation of dichromate hydroxide

Conversion of dichromate into chromate ion

Oxidation of potassium hydroxide ot potassium peroxide

`CrO_(3)`

`Cr_(2)O_(7)`

`Cr_(2)O_(3)`

`CrO_(5)`

a deep red vapour is evolved

the vapour when passed into NaOH solution gives a yellow solution of `Na_(2) CrO_(4)`

chlorine gas is evolved

chromyl chloride is formed