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Question

Bromine water has a red-brown colour due to the presence of bromine in it. A student adds bromine water to a little of cooking oil and butter taken in separate test-tubes.
(a) What will the student observe when he adds bromine water to cooking oil? Give reason for your answer.
​(b) What will the student observe when he adds bromine water to butter? Give reason for your answer.

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Solution

(a) When a student adds bromine water in cooking oil, bromine water will lose its colour. Cooking oil is unsaturated but it will become saturated by addition reaction with bromine water.

(b) When a student adds bromine water to butter, no change will be observed as butter is saturated and no reaction will occur.

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