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111. Potassium nitrate is used in _______________ and __________________.
  A.  Flexible plastics, PVC
  B.  Explosives, Fertilizers
  C.  Artificial Fibres, Paints
  D.  Fertilizers, Food preservative
     
   
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112. Which gas is filled in the electric bulb and tyres' tubes?
  A.  Argon
  B.  Helium
  C.  Nitrogen
  D.  Hydrogen
     
   
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113. Which one of the following gas is not a greenhouse gas?
  A.  Carbon dioxide
  B.  Nitrous oxide
  C.  Methane
  D.  Hydrogen
     
   
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114. ______________ is the most important ore of aluminum.
  A.  Bauxite
  B.  Haematite
  C.  Magnetite
  D.  Tetrahedrite
     
   
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115. ________________ is responsible for brass for discolouring it in the air.
  A.  Nitrogen sulphide
  B.  Potassium Sulphide
  C.  Hydrogen Sulphide
  D.  Aluminium Sulphide
     
   
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116. Which one of the following is most soluble in water?
  A.  Salt
  B.  Sugar
  C.  Milk
  D.  Chalk powder
     
   
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117. Quartz clocks contains Quartz crystals which are chemically known as _____________.
  A.  Sulfur Dioxide
  B.  Manganese dioxide
  C.  Bromine dioxide
  D.  Silicon dioxide
     
   
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118. ______________ is an alkaline among the following?
  A.  Vinegar
  B.  Saliva
  C.  Ammonia
  D.  Acid rain​
     
   
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119. Soda water contains ________________ in it.
  A.  Carbon dioxide
  B.  Acetic acid
  C.  Hydrogen sulphide
  D.  Nitric Acid
     
   
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120. ______________ is often called the ‘central science’.
  A.  Biology
  B.  Chemistry
  C.  Physics
  D.  Geology
     
   
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