Chemistry Page-9

81) In colorful diamond, different colors are present due to:
(A) Impurities
(B) Angular bonds between the carbon atoms
(C) Different patterns of carbon chains
(D) None of the above

82) All of the followings are different uses of hydrogen peroxide except
(A) Used as bleaching agent
(B) Used to de-odor sewers
(C) Used as fuel in space
(D) Used to prepare organic peroxides

83) Ozone is present in which of the following layers of atmosphere
(A) Troposphere and Thermosphere
(B) Troposphere and Stratosphere
(C) Mesosphere
(D) Thermosphere

84) Which of the following method is used in manufacturing of sulphuric acid
(A) Contact process
(B) Frasch method
(C) Ostwald's method
(D) Haber's process

85) The process of smelting and cooling converts pig iron into
(A) Silicon steel
(B) Cast iron
(C) Wrought iron
(D) Steel

86) Pure iron is obtained by the reduction of which of the followings in the blast furnace
(A) Haematite
(B) Magnetite
(C) Iron oxide
(D) Limonite

87) Methane is used in daily life with the name of
(A) Carbon Dioxide
(B) Natural Gas
(C) Carbon Monoxide
(D) Calcium Carbonate

88) When electricity is passed through neon it glows.
(A) Blue
(B) Green
(C) Red
(D) Yellow

89) Argon and which gas is used in various types of fluorescent and phototubes
(A) Oxygen
(B) Helium
(C) Neon
(D) Krypton

90) Enzymes are
(A) Chemical catalyst
(B) Biological catalyst
(C) Organic catalyst
(D) Inorganic catalyst

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