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

  • question_answer
    Which of the following chemical reactions is endothermic?

    A) \[{{N}_{2}}+{{O}_{2}}\to 2NO\]        

    B) \[C+2S\to C{{S}_{2}}\]

    C) \[C+{{O}_{2}}\to C{{O}_{2}}\]

    D)        Both [a] and [b]

    E) None of these

    Correct Answer: C


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