General knowledge(GK)/General Knowledge(GK) MCQS-General Science-Elements and Metals MCQs :- multiple choice questions and answers. e.g General knowledge(GK) MCQS,General knowledge(GK) Mock Tests , General knowledge(GK) Practice Papers ,General knowledge(GK) Sample Test,General knowledge(GK) Sample questions

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Question 1: Brass gets discoloured in air because of the presence of which of the following gases in air?

Oxygen

Hydrogen sulphide

Carbon dioxide

Nitrogen

Total MCQS Questions are 62 in this paper General Knowledge(GK) MCQS-General Science-Elements and Metals
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