8th Class General Knowledge Sample Paper General Knowledge Olympiad Model Test Paper-4

  • question_answer Brass gets discoloured in air because of the presence of which of the following gases in the air?

    A)  Carbon dioxide 

    B)  Nitrogen

    C)  Hydrogen sulphide

    D)  All of these

    E)  None of these

    Correct Answer: C

    Solution :

    Not Available    

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