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Chlorine can not be used
A. As bleaching agent
B. In sterilisation
C. In preparation of antiseptic
D. For extraction of silver and copper

Answer
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Hint: Chlorine has very high reactivity without any explosive nature. Hence, the applications of chlorine are based on these advantages. Chlorine is highly used as a bleaching agent, sterilisation and preparation of antiseptic.

Complete Step by Step Answer:
Chlorine is a halogen element. The chemical formula of bleaching powder is $Ca(OCl)Cl$ . Thus bleaching powder contains chlorine. So, chlorine is widely used as a bleaching agent.

Chlorine is highly and widely used as an antiseptic because it can destroy viruses and bacteria that cause several diseases by breaking the bond of the molecules. Chlorine dioxide is highly oxidant. It can be used to kill bacteria, viruses etc present in laboratory, clinic, home etc. That’s why chlorine is widely and highly used in sterilisation of medical clinics, medical laboratories, rooms etc.

Chlorine is not used in the extraction of silver and copper. Thus we can write that chlorine cannot be used for extraction of copper and silver.
Thus the correct option is D.

Note: Chlorine has high reactivity. Thus it can react with both copper and silver to form respective copper chloride and silver chloride.