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Which of the following compound on reaction with NaOH and `Na_2 O_2` gives yellow colour?
A. `Cr(OH)_(3)`
B. `Zn(OH)_(2)`
C. `Al(OH)_(3)`
D. none of these

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`3Na_(2) O_(2) +2Cr(OH)_(3) overset(Delta) to 2NaOH +2H_(2)O + underset("Yellow")(2Na_(2)CrO_(4))`

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