ANSWER KEY : 1- ( B),2- ( D), 3- ( D), 4- ( D),5- (B),6- ( B), 7- ( A),8- ( B),9- (B),10- ( A)
1.Brass gets discoloured in air because of the presence of which of the following gases in air?
B. Hydrogen sulphide
C. Carbon dioxide
2.Which of the following metals remain in liquid for under normal conditions?
3.Potassium Permanganate is used for purifying drinking water, because
A. it is a sterilising agent
B. it dissolves the impurities of water
C. it is a reducing agent
D. it is an oxidising agent
4.Which of the following is an element?
5. Which of the following is a non metal that remains liquid at room temperature?
6. Chlorophyll is a naturally occurring chelate compound in which central metal is
7. Which of the following is used in pencils?
8.Which of the following metals forms an amalgam with other metals?
9.Chemical formula for water is
10.The gas usually filled in the electric bulb is
C. carbon dioxide