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6NaOH+3S=2Na2S+Na2SO3+3H2O       (1)
Na2SO3+S=Na2S2O3                           (2)
8Na2CrO4+Na2S+23H2O=8Cr(OH)3+3Na2S2O3+22NaOH    (3)
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4Na2CrO4+6S+7H2O=4Cr(OH)3+3Na2S2O3+2NaOH     (4)
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