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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
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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
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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
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4 Which of the following is used in pencils?
A) Graphite
B) Silicon
C) Charcoal
D) Phosphorous
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5 Which of the following metals forms an amalgam with other metals?
A) Tin
B) Mercury
C) Lead
D) Zinc
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6 The gas usually filled in the electric bulb is
A) nitrogen
B) hydrogen
C) carbon dioxide
D) oxygen
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