A solution of CrO3 in amyl alcohol has a colour: — Solution | JEE Chemistry

MCQEasyJEE 2023Complex Formation & Catalytic Properties

A solution of $CrO_3$ in amyl alcohol has a _____ colour:

A
Green
B
Orange-Red
C
Yellow
D
Blue

Answer

Correct answer:D

Step-by-step solution

Standard Method

Given: A solution of $CrO_3$ in amyl alcohol.

Find: The colour of this solution.

The solution states that $CrO_3$ (chromium trioxide) in amyl alcohol forms a blue complex. This characteristic blue colour arises due to formation of a coordination complex in the organic solvent.

Therefore, the correct option is D and the colour is Blue.

Common mistakes

Using the answer key key without checking the solution explanation. Here the listed correct answer says C, but the solution clearly concludes Blue, so the answer must be taken as D.
Confusing the original colour of chromium compounds with the colour of the solution in amyl alcohol. The question asks for the colour of the solution of $CrO_3$ in amyl alcohol, not the general appearance of all chromium compounds.

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