General%20knowledge(GK)/Competitive%20Exams%20(History)%20Part%204 MCQs :- multiple choice questions and answers. e.g General%20knowledge(GK) MCQS,General%20knowledge(GK) Mock Tests , General%20knowledge(GK) Practice Papers ,General%20knowledge(GK) Sample Test,General%20knowledge(GK) Sample questions

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Question 1: Which among the following is the dangerous Green House Gas, created by the Waste Water?

Methane

Nitrogen

Ethane

None

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