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

  • question_answer
    Which of the following is not a Combination reaction?

    A) \[2\,\,Mg+{{O}_{2}}\to 2\,\,MgO\]         

    B) \[{{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}\]

    C) \[Ca{{(OH)}_{2}}\to CaO+{{H}_{2}}O\]

    D) \[2{{H}_{2}}+{{O}_{2}}\to 2{{H}_{2}}O\]

    E) None of these

    Correct Answer: C


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