Which of the following compounds, on reaction with NaOH and Na _ 2...

Which of the following compounds, on reaction with

NaOH

and

{Na}_{2}{O}_{2}

gives yellow colour?

Options

AZn{ $\left(OH\right)}_{2}$
BAl{ $\left(OH\right)}_{3}$
CCr{ $\left(OH\right)}_{3}$
D ${CaCO}_{3}$

Correct answer

C. Cr{ $\left(OH\right)}_{3}$

Step-by-step solution

Chromium hydroxide, i.e. $Cr{\left(\text{ OH }\right)}$ _{3} $when reacts with$ NaOH $and$ {Na}_{2}{O}_{2} $, gives yellow colour of sodium chromate. The whole reaction is as follows</p><p>$ 3{Na}_{2}{O}_{2} + 2Cr{\left(OH\right)}_{3} ⟶ \mathop{2{Na}_{2}{CrO}_{4}}_{( yellow )} + 2{H}_{2}O + 2NaOH

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