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CR+NAOH+h2o2. >Nacro2-->na2cro4. Br+na2s2o3 + h2o. NAOH 2 +na2s.
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CR+NAOH+h2o2. >Nacro2-->na2cro4. Br+na2s2o3 + h2o. NAOH 2 +na2s. 