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when H2S is pass through an acidified solution of K2Cr2O7, the orange colour changes to...

when H2S is pass through an acidified solution of K2Cr2O7, the orange colour changes to green,this is because(a) 3state of chromium is oxidized to 6 state(b) state chromium is reduced to 3 state (c)S2- ion changes to S(d)H2S is a good oxidizing agent?
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