BITSAT2019ChemistryPractical ChemistryActual

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

Options

AZn OH 2
BAl OH 3
CCr OH 3
DCaCO 3

Correct answer

C. Cr OH 3

Step-by-step solution

Chromium hydroxide, i.e. Cr OH 3 when reacts with NaOH and Na 2 O 2 , gives yellow colour of sodium chromate. The whole reaction is as follows 3 Na 2 O 2 + 2 Cr OH 3 ⟶ 2 Na 2 CrO 4 ( yellow ) + 2 H 2 O + 2 NaOH

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