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Chromium How does chromium(III) hydroxide + alkali hydroxide +react to form chromium(VI) with hydrogen peroxide?

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Chromium (III) hydroxide + alkali hydroxide + hydrogen peroxide

$$\ce{2Cr(OH)3 + 4NaOH + 3H2O2 -> 2Na2CrO4 + 8H2O}$$

How does this reaction occur? We suddenly get sodium chromate in the place of chromium hydroxide. I can't understand it. We mix two hydroxides and get a salt?

What role does the peroxide play?