Geneneral knowledge

	Exercise Elements and Metals Measurements Nuclear Science Synthetic Materials "When ambition ends, happiness begins." - (Proverb)	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 Workspace Report Discuss in Forum 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 Workspace Report Discuss in Forum 3.  Chlorophyll is a naturally occurring chelate compound in which central metal is A. copper B. magnesium C. iron D. calcium View Answer Workspace Report Discuss in Forum 4.  Which of the following is used in pencils? A. Graphite B. Silicon C. Charcoal D. Phosphorous View Answer Workspace Report Discuss in Forum 5.  Which of the following metals forms an amalgam with other metals? A. Tin B. Mercury C. Lead D. Zinc View Answer Workspace Report Discuss in Forum 12345678910111213Next »