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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2001

  • question_answer
    1.5 moles of \[{{\text{O}}_{\text{2}}}\] combine with Mg to form the oxide \[\text{MgO}\text{.}\]The mass of Mg that has combined is \[\text{(Mg}\,\text{=}\,\text{24)}\,\text{:}\]

    A)  72 g                                      

    B)  36 g

    C)  48 g                                      

    D)  24 g

    Correct Answer: A

    Solution :

    \[2Mg+{{O}_{2}}\xrightarrow{{}}2MgO\] \[\because \]1 mole oxygen is combined with 2 mole of Mg to produce MgO Hence \[\text{2}\,\text{ }\!\!\times\!\!\text{ }\,\text{mol}\text{.}\,\text{wt}\text{.}\,\]of Mg \[=2\times 24=48\] \[\therefore \]1.5 mole of oxygen combines with \[48\times 1.5=72\,gm.\]


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