GK Questions: General Science(Chemistry) – Set 25

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1. Which of  the following is used for separation and of purification of organic compounds ?
   1.Chromatography
   2.Crystallisation
   3.Osmosis
   4.Reverse Osmosis
   5.None of these
   
   Answer & Explanation

   Answer – 1.Chromatography
   Explanation :
   To separate Organic compounds with the help of Column Chromatographic technique.It is useful methods for the separation and purification of both solids and liquids
   
   
   
2. Blue colour is related to
   1.Copper Oxide
   2.Cobalt Oxide
   3.Iron Oxide
   4.Lead Oxide
   5.None of these
   
   Answer & Explanation

   Answer – 2.Cobalt Oxide
   Explanation :
   Cobalt(II) oxide or cobalt monoxide is an inorganic compound that appears as olive-green to red crystals, or as a greyish or black powder
   
   
   
3. Crook’s glass contains which of the following ?
   1.Cesium Oxide
   2.Lead Oxide
   3.Tin Oxide
   4.Potassium
   5.None of these
   
   Answer & Explanation

   Answer – 1.Cesium Oxide
   Explanation :
   Crook’s glass contains cesium oxides.
   
   
   
4. MnO₂   is used as a substance to make which colour ?
   1.Pink
   2.Blue
   3.Violet
   4.Orange
   5.None of these
   
   Answer & Explanation

   Answer – 3.Violet
   Explanation :
   MnO₂ is an secondary alloy addition to steel and can make violet colored glass.
   
   
   
5. Green colour is given by
   1.Sodium Oxide
   2.Manganese Oxide
   3.Copper Oxide
   4.Chromium oxide
   5.None of these
   
   Answer & Explanation

   Answer – 4.Chromium oxide
   Explanation :
   Chromium oxides are also used as a green color in glass making and as a glaze in ceramics
   
   
   
6. ……………… is known as fool’s gold
   1.Iron Acetate
   2.Iron Oxide
   3.Iron Pyrite
   4.Iron Nitrate
   5.None of these
   
   Answer & Explanation

   Answer – 3.Iron Pyrite
   Explanation :
   The mineral pyrite, or iron pyrite, also known as fool’s gold, is an iron sulfide with the chemical formula FeS2.
   
   
   
7. Which is used to kill rats ?
   1.Potassium Sulphate
   2.Zinc Nitrate
   3.Zinc Phosphate
   4.Zinc Phosphide
   5.None of these
   
   Answer & Explanation

   Answer – 4.Zinc Phosphide
   Explanation :
   The dangers of zinc phosphide, a poison used to kill gophers and moles, has hit the press.
   
   
   
8. Silver Spoon is not used with boiling egg because it makes which of the following changes ?
   1.Poisonous
   2.Colour changes
   3.Gas production
   4.Odour smell
   5.None of these
   
   Answer & Explanation

   Answer – 2.Colour changes
   Explanation :
   A silver plate turn black when a boiled egg is placed on it.
   
   
   
9. ……………….is also known as Flower of Zinc
   1.ZnS
   2.ZnO
   3.ZnCl
   4.ZnO₂
   5.None of these
   
   Answer & Explanation

   Answer – 2.ZnO
   Explanation :
   ZnO Also called flowers of zinc, philosopher’s wool.
   
   
   
10. Which of the following gas is used in Holme’s signals ?
    1.Bromine
    2.Arsine
    3.Phosphine
    4.Fluorine
    5.None of these
    
    Answer & Explanation

    Answer – 3.Phosphine
    Explanation :
    The spontaneous combustion of phosphine is technically used in Holme’s signals.