2. Questions Bank
  3. 7th Class
  4. Science
  5. Physical and Chemical Changes

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

  • question_answer
    Washing soda is:

    A) Calcium carbonate         

    B) Calcium sulphate

    C) Sodium carbonate

    D)        Sodium hydrogen carbonate

    E) None of these

    Correct Answer: C

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