Railways R.R.C. (Secundrabad) Solved Paper Held on 1-12-2013

  • question_answer
    Which of the following is not a physical change?

    A) Dissolution of Oxygen in water

    B) Dissolution of Carbon dioxide in water

    C) Dissolution of salt in water

    D) None of the above

    Correct Answer: B

    Solution :

    When carbon dioxide dissolved in water a weak acid carbonic acid\[({{H}_{2}}C{{O}_{3}}or\,\,OC{{(OH)}_{2}})\]is formed. \[C{{O}_{2}}+{{H}_{2}}O={{H}_{2}}C{{O}_{3}}\]


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