The evolution of a red-brown gas on heating a salt with and concentrated can arise from:

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Problem

The evolution of a red-brown gas on heating a salt with K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7 and concentrated H2SO4\text{H}_2\text{SO}_4 can arise from: (1) chloride (2) bromide (3) nitrate (4) nitrite

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