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9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    Identify the correct increasing order of molecular weights of the given compounds.

    A)  \[{{H}_{2}}O>{{H}_{2}}S>C{{O}_{2}}>S{{O}_{2}}\]

    B)  \[{{H}_{2}}O>{{H}_{2}}S>C{{O}_{2}}>S{{O}_{2}}\]

    C)  \[{{H}_{2}}O<{{H}_{2}}S<C{{O}_{2}}<S{{O}_{2}}\]  

    D)  \[{{H}_{2}}O>{{H}_{2}}S>C{{O}_{2}}>S{{O}_{2}}\]

    Correct Answer: C

    Solution :

     The molecular weights of\[{{H}_{2}}O,\,\,{{H}_{2}}S,\,\,C{{O}_{2}}\]and\[S{{O}_{2}}\]are \[18,\,\,34,\,\,44\] and \[64\] respectively. Hence, the increasing order of molecular weights is\[{{H}_{2}}O<{{H}_{2}}S<C{{O}_{2}}<S{{O}_{2}}\].


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