General Science - Elements and Metals

1.	Brass gets discoloured in air because of the presence of which of the following gases in air?
	A. Oxygen B. Hydrogen sulphide C. Carbon dioxide D. Nitrogen View Answer Discuss in Forum Workspace Report

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2.	Which of the following is a non metal that remains liquid at room temperature?
	A. Phosphorous B. Bromine C. Chlorine D. Helium View Answer Discuss in Forum Workspace Report

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3.	Chlorophyll is a naturally occurring chelate compound in which central metal is
	A. copper B. magnesium C. iron D. calcium View Answer Discuss in Forum Workspace Report

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4.	Which of the following is used in pencils?
	A. Graphite B. Silicon C. Charcoal D. Phosphorous View Answer Discuss in Forum Workspace Report

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5.	Which of the following metals forms an amalgam with other metals?
	A. Tin B. Mercury C. Lead D. Zinc View Answer Discuss in Forum Workspace Report