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1. Question1 points
Brass gets discoloured in air because of the presence of which of the following gases in air?CorrectIncorrect
2. Question1 points
Which of the following is a non metal that remains liquid at room temperature?CorrectIncorrect
3. Question1 points
Chlorophyll is a naturally occurring chelate compound in which central metal isCorrectIncorrect
4. Question1 points
Which of the following is used in pencils?CorrectIncorrect
5. Question1 points
Which of the following metals forms an amalgam with other metals?CorrectIncorrect