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When an aqueous solution of compound X was mixed with few drops of bromine water, the colour of the mixture remained yellow.
When another portion of solution X was reacted with acidified potassium dichromate (VI), the colour of the mixture changed from orange to green.
(a) What conclusion can be made from use of:
(i) Bromine water?
(ii) Acidified potassium dichromate (VI)?
(b) Solution X was reacted with a piece of a metal and colourless gas was produced. Describe a simple experiment to identify the gas.