Chlorine gas can be prepared in laboratory with hydrochloric acid and manganese-dioxide.
Method
Put manganese lump in a round flask , now put concentrated hydrochloric acid into the round flask with thistle funnel and fit the flask with cork having a hole ,Now attach a tube into the hole of cork and leave to tube into an empty container,so the gas can be collected.The container must be sealed with cork having only one hole for the attachment of tube (from flask to container).Set the apparatus and there should be no leakage.Now heat the manganese lump and hydrochloric acid with a bunsen burner...
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