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  4. Which of the following compounds, on reaction with NaOH and Na2O2, gives yellow colour?

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Q. Which of the following compounds, on reaction with $NaOH$ and $ Na_{2}O_{2}, $ gives yellow colour?

AFMCAFMC 2010The d-and f-Block Elements

Solution:

Chromium hydroxide, $Cr ( OH )_{3}$, when reacts with $NaOH$ and $Na _{2} O _{2}$, gives sodium chromate, which is yellow in colour.
$3Na_2O_2 + 2Cr(OH)_3 \rightarrow \underset{\text{yellow}}{2Na_2CrO_4} + 2H_2O + 2NaOH$