Chemical Reactions And Equations

10 Questions | Total Attempts: 18

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Chemical Reactions And Equations


Questions and Answers
  • 1. 
    The electrolytic decomposition of water gives H2 and O2 in the ratio of
    • A. 

      1:2 by volume

    • B. 

      2:1 by volume

    • C. 

      8:1 by mass

    • D. 

      1:2 by mass

  • 2. 
     The chemical formula of lead sulphate is Pb(SO4)2
    • A. 

      True

    • B. 

      False

  • 3. 
    In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of
    • A. 

      Hydrochloric acid

    • B. 

      Barium sulphate

    • C. 

      Chlorine

    • D. 

      Sulphur

  • 4. 
    A chemical reaction does not involve:
    • A. 

      Formation of new substances having entirely different properties than that of the  reactants

    • B. 

      Breaking of old chemical bonds and formation of new chemical bonds

    • C. 

      Changing of the atoms of on element into those of another element to form new  products

    • D. 

      Rearrangement of the atoms of reactants to form new products

  • 5. 
      On decomposition of lead nitrate  [Blank] gas (write name) is evolved which is [Blank] in colour.
  • 6. 
    Which of the following product is formed when calcium oxide reacts with water?
    • A. 

      Slaked lime

    • B. 

      Carbon dioxide

    • C. 

      Calcium oxide

    • D. 

      Oxygen gas

  • 7. 
    What happens when carbon dioxide is passed in lime water?
    • A. 

      Lime water turns milky because of formation of water

    • B. 

      Lime water turns milky because of formation of calcium carbonate

    • C. 

      Lime water turns red because of formation permanganate

    • D. 

      Lime water turns red because of formation of copper sulphate

  • 8. 
    What happens when Copper metal is dipped in the solution of zinc sulphate?
    • A. 

      Copper sulphate is formed

    • B. 

      Zinc metal is separated

    • C. 

      Oxygen gas is formed

    • D. 

      No reaction takes place

  • 9. 
    Which of the following is termed as rancidity?
    • A. 

      Reduction of oxygen present in food

    • B. 

      Oxidation of sugar present in food

    • C. 

      Oxidation of oil present in food

    • D. 

      All of the above

  • 10. 
    The following reactions is an example of
    • A. 

      Redox reaction

    • B. 

      Electrolytic decomposition

    • C. 

      Thermal decomposition

    • D. 

      Photolytic decomposition

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