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  4. Which of the following compound, on reaction with NaOH and Na 2 O 2, gives yellow colour?

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Q. Which of the following compound, on reaction with $NaOH$ and $Na _{2} O _{2}$, gives yellow colour?

AIIMSAIIMS 1997The d-and f-Block Elements

Solution:

Yellow colour is due to the formation of $CrO _{4}^{2-}$ ion.

$Cr ( OH )_{3}+ NaOH + Na _{2} O _{2} \rightarrow Na _{2} CrO _{4}+2 H _{2} O$