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7th Class Science Physical and Chemical Changes Question Bank Physical and Chemical Changes

  • question_answer
    DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 1 Take a small quantity of copper sulphate crystals and dissolve it in a small quantity of water to obtain blue coloured solution. Add a few drops of dilute sulphuric acid. Now, put 3-5 medium sized iron nails in it. Soon the colour of blue solution changes to green and a brown deposit appears on the iron nails. Change of colour from blue to green in the above activity represents:

    A) physical change          

    B) chemical change

    C) Both of the above       

    D) None of these

    Correct Answer: B

    Solution :

    Change of colour is due to a chemical reaction so it is a chemical change.


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