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

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    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. Green colour of the solution is due to the formation of....................

    A) Copper sulphate         

    B) Iron sulphate

    C) Copper metal              

    D) none of these

    Correct Answer: B

    Solution :

    Green colour of the solution is due to iron sulphate.


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