8th Class Science Materials : Metals and Non-metals Question Bank Metals and Non-metals

  • question_answer
    Observe the given figure carefully.
     
    X and Y respectively are
       

    A) Zn and Ag                  

    B) Au and Cu                 

    C) Fe and Cu                 

    D) Zn and Cu

    Correct Answer: D

    Solution :

    Zinc is more reactive than copper so, Zn displaces Cu from its blue, \[\text{CuS}{{\text{O}}_{\text{4}}}\] solution and forms colourless, \[\text{ZnS}{{\text{O}}_{\text{4}}}\] solution. \[\underset{(X)}{\mathop{\text{Zn}}}\,+\underset{(Blue)}{\mathop{CuS{{O}_{4}}}}\,\to \underset{(Colourless)}{\mathop{ZnS{{O}_{4}}}}\,+\underset{(Y)}{\mathop{Cu}}\,\]


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