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

  • question_answer
    On adding a few drops of dilute sulphuric acid to the blue vitriol (copper sulphate) solution, we get a blue coloured solution. When we drop a shaving blade into this blue coloured solution blue colour changes to green after sometime. Which type of change is illustrated by this activity?

    A) Physical change

    B) Chemical change

    C) Both of these

    D) None of these

    Correct Answer: B

    Solution :

    Copper sulphate (blue) reacts with iron (in shaving blade) to form iron sulphate (green).


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