Complete the following reactions
(a) An alkaline solution of potassium ferricyanide is treated with hydrogen peroxide.
(b) Chromium hydroxide is treated with hydrogen peroxide in the presence of NaOH.

Explanation

(a) Potassium freeicyanide is reduced
`2K_(3)Fe(CN)_(6) +2KOH+H_(2)O_(2) to 2K_(4)Fe(CN)_(6) + 2H_(2) O+O_(2)`
(b) `Cr(OH)_(3)` is converted into yellow colured `Na_(2)CrO_(4)`
`2Cr(OH)_(3) + 4NaOH+ 3H_(2) O_(2) to Na_(2) CrO_(4) + 8H_(2)O`