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Physical and Chemical Changes Test - 3

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Physical and Chemical Changes Test - 3
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  • Question 1
    1 / -0
    While working in a lab, Mary dropped a blade in a solution of copper sulphate. She observed a change in the colour of the solution from                              
  • Question 2
    1 / -0
    Consider the following reaction:
     2KClO3  2KCl + O2
    In this reaction, potassium chlorate gives potassium chloride and oxygen. How many atoms of oxygen are present in the reactant of the given reaction?
  • Question 3
    1 / -0
    Which gas appears as bubbles on addition of vinegar in baking soda?
  • Question 4
    1 / -0
    Mg + O2  'X'
    'X' + H2O  'Y'
    What are 'X' and 'Y' in the above two reactions?
  • Question 5
    1 / -0
    Which of the following is not a chemical change?
  • Question 6
    1 / -0
    Which of the following features is not related to a physical change?
  • Question 7
    1 / -0
    Complete the following reaction:

    Copper sulphate solution + Iron  ? + Copper
  • Question 8
    1 / -0
    When carbon dioxide is passed through limewater, it turns milky due to the formation of
  • Question 9
    1 / -0
    The presence of ______ prevents the rusting of iron.                                     
  • Question 10
    1 / -0
    Which of the following statements is/are false?
    a. Charring of sugar into charcoal from strong heating is a physical change.
    b. New medicines are produced by a chain of chemical reactions.
    c. Formation of curd is an example of a chemical change.
  • Question 11
    1 / -0
    Soft drinks contain carbon dioxide and hydrogen. Why are they sour in taste when neither hydrogen nor carbon dioxide is sour?
  • Question 12
    1 / -0
    Iron is coated with a layer of ________ to protect it from rusting.
  • Question 13
    1 / -0
    Which of the following processes is not a chemical change?
  • Question 14
    1 / -0
    Which of the following is the standard test for carbon dioxide? 
  • Question 15
    1 / -0
    Ships suffer a lot of damage because of rusting. Which of the following helps in slowing down the rusting of ships?
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