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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 45

  • question_answer
    Arrange the following metals in order in which they displace each other from the solutions of their salts in decreasing order. \[Al,\text{ }Cu,\text{ }Fe,\text{ }Mg\]and\[Zn\]. \[[E{{{}^\circ }_{A{{l}^{3+}}/Al}}=-1.66V,\,\,E{{{}^\circ }_{C{{u}^{2+}}/Cu}}=+0.34\,V,\] \[E{{{}^\circ }_{F{{e}^{2+}}/Fe}}=-0.44V,\,\,E{{{}^\circ }_{M{{g}^{2+}}/Mg}}=-2.36V,\]and \[E{{{}^\circ }_{Z{{n}^{2+}}/Zn}}=-0.76V\]]

    A) \[Cu,\text{ }Fe,\text{ }Zn,\text{ }Al,\text{ }Mg\]

    B) \[Fe,\text{ }Zn,\text{ }Cu,\text{ }Al,\text{ }Mg\]

    C) \[Mg,Cu,Fe,Zn,Al\]    

    D) \[Mg,\text{ }Al,\text{ }Zn,\text{ }Fe,\text{ }Cu\]

    Correct Answer: D

    Solution :

    Since a metal with lower electrode potential is a stronger reducing agent, \[Mg\]can displace all the given metals, \[Al\] can displace all metals except \[Mg\]. \[Zn\]can displace all metals except \[Mg\] and \[Al\]. Fe can displace only \[Cu\]. The order in which they can displace each other from their salt solutions is \[Mg,\text{ }Al,\text{ }Zn,\text{ }Fe,\text{ }Cu.\]


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