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4(cr2^6+3e----->cr2^3)
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3S^-2 + 8 Cr^6 -------> 6S^0 + 8cr^3
4 k2cr2O7+ 3 H2SO4+ 6 H2S------>8 KHSO4+ 4 Cr2(SO4)3+3S2+H2O