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Name two poisonous gases which can be prepared from chlorine gas.

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Two poisonous gases which can be prepared from Cl2 are :
(i) Mustard gas
(ii) Phosgene
These are prepared as follows :
(i) Cl2 is passed through boiling S, when S2Cl2 is formed. This on reaction with ethylene gives mustard gas which was used in second world war.

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