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Potassium dichromate is a good oxidising...

Potassium dichromate is a good oxidising agent in acidic medium the oxidation state of chromium changes by

A

2

B

3

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
b
In the presence of dil `H_(2)SO_(4)` the oxidation state of Cr changes by +3
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Potassium dichromate acts as a strong oxidising agent in the acidic medium. When heated with a metal chloride and conc. sulphuric acid, it gives orange red fumes. On passing these fumes through sodium hydroxide, it gives a yellow solution (X) and this acidified solution gives yellow precipitate (Y) with lead acetate. On heating potassium dichromate with KOH, it forms a yellow solution (Z) which on acidification changes to orange colour. Acidified solution of dichromate ion gives deep blue colour with H_2O_2 due to the formation of (P) The oxidation state of Cr in compound P

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