JEE Main202124 Feb 2021Evening ShiftChemistryd and f Block ElementsActual
The incorrect statement among the following is:
Options
- ACr 2 O 3 is an amphoteric oxide
- BVOSO 4 is a reducing agent
- CRuO 4 is an oxidizing agent
- DRed colour of ruby is due to the presence of Co 3 +
Correct answer
D. Red colour of ruby is due to the presence of Co 3 +
Step-by-step solution
(i) In VOSO 4 , V ' ' is in + 4 oxidation state. So it act as oxidising agent. (ii) Cr 2 O 3 is an amphoteric oxide. (iii) In RuO 4 , ' Ru ' is in + 8 oxidation state. So it act as oxidising agent. (iv) Red colour of ruby is due to the presence of Cr + 3 ions in Al 2 O 2 .