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
    \[NaHC{{O}_{3}}\]is:

    A) Washing soda    

    B) Baking soda

    C) Alum                    

    D)      Rust

    E) None of these

    Correct Answer: B

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