Analytical ChemistryHard
Question
Which of the following compounds on reaction with NaOH and Na2O2 gives yellow colour solution?
Options
A.Cr(OH)3
B.Zn(OH)2
C.Al(OH)3
D.Fe(OH)3
Solution
3Na2O2 + 2Cr(OH)3 
2NaOH + 2H2O + 2Na2CrO4 (yellow)
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