Identify the gas which is not present in free state in the nature and was used as a chief weapon in the first world war by Germany?
A
Chlorine
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B
Hydrogen
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C
Oxygen
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D
Nitrogen
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Solution
The correct option is A Chlorine Chlorine is a very reactive non-metal. It is not present in its free state in nature. Some chlorine containing compounds are hydrogen chloride and sodium chloride. During the first world war, Germany used chlorine gas as a chief chemical weapon. The use of this chemical weapon resulted in killing several people and many were seriously injured. Chlorine inhaled in large quantities is dangerous.