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NEET Sample Paper NEET Sample Test Paper-9

  • question_answer
    \[Ni/N{{i}^{2+}}\,[1.0M]\,\,||A{{u}^{3+}}[1.0M]/Au\]
    (Where \[{{E}^{o}}\] for \[N{{i}^{2+}}/Ni\] is \[-0.25\text{ }V,\]
    \[{{E}^{o}}\] for \[A{{u}^{3+}}/Au\]is\[0.150\text{ }V\])
    What is the emf of the cell?

    A)  \[+1.25\,V\]                    

    B)  \[-1.75\,V\] nmn

    C)   \[+1.75\text{ }V\]                      

    D)  \[+0.4\text{ }V\]

    Correct Answer: D

    Solution :

    \[Ni/N{{i}^{2+}}[1.0M]\,\,||A{{u}^{3+}}[1.0\,M]/Au\]
    \[E_{cell}^{o}\left( A{{u}^{3+}}/Au \right)=0.15\,V\]
    \[E_{cell}^{o}\left( N{{i}^{2+}}/Ni \right)=-0.25\,V\]
    \[E_{cell}^{o}=E_{cathode}^{o}-E_{anode}^{o}\]
    \[=0.150-(-0.25)\]
    \[=+0.4\,V\]


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