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A one litre flask is full of brown bromine vapour. The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some

1. pieces of marble
2. animal charcoal powder
3. carbon tetrachloride
4. carbon disulphide

Correct answer: pieces of marble

Solution

Adding pieces of marble will not interact with bromine vapour chemically or physically, so the intensity of the brown colour remains unchanged. Other options involve substances that can dissolve or adsorb bromine.

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