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JEE Main & Advanced Chemistry Organic Chemistry: Some Basic Principles & Techniques / कार्बनिक रसायन : कुछ मूलभूत सिद्धांत एवं तकन Question Bank Mock Test - General Principles Processes of Isolation of Elements

  • question_answer
    Consider the following reactions at\[1000{}^\circ C\]. \[Zn(s)+\frac{1}{2}{{O}_{2}}(g)\to ZnO(g);\,\Delta {{G}^{o}}=-360\,kJ/mol\] \[C(s)+\frac{1}{2}{{O}_{2}}(g)\to CO(g);\,\Delta {{G}^{o}}=-400\,kJ/mol\] Choose the correct statement at \[1000{}^\circ C\].

    A) Zinc can be oxidized by CO

    B) Zinc oxide can be reduced by C

    C) Both statements [a] and [b] are true

    D) Both statements [a] and [b] are false

    Correct Answer: B

    Solution :

    [b] Carbon is the suitable reducing agent for zinc oxide at \[1000{}^\circ C\] as \[\Delta {{G}^{o}}_{CO}-\Delta {{G}^{o}}_{ZnO}\] is negative. \[\Delta {{G}^{o}}_{CO}-\Delta {{G}^{o}}_{ZnO}=-\,400-(-360)=-\,40\]KJ/mol.


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