question_answer

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: [AIPMT 1998]

A) pieces of marble 

B) animal charcoal powder

C) carbon tetrachloride        

D) carbon disulphide

Correct Answer: A

Solution :

[a] Bromine is soluble in  and . Animal charcoal also adsorbs on bromine water. But marble has no action with . So, after adding  marble piece to the flask, there will be no decreament in the intensity of brown colour.