SATHEE: Redox Reactions And Electrochemistry Ques 87

Redox Reactions And Electrochemistry Ques 87

Question: The standard reduction potential $N a C l$ for the half reactions are as $Z n = Z n^{2 +} + 2 e^{-}; E^{o} = + 0.76, V$ $F e = F e^{2 +} + 2 e^{-}; E^{o} = + 0.41, V$ The EMF for cell reaction $F e^{2 +} + Z n, \to, Z n^{2 +} + F e$ is [IIT 1988; CBSE PMT 1993, 96; BHU 1995, 2000; CPMT 2000; KCET 2000; AIIMS 2001; Orissa JEE 2002]

Options:

A) $-, 0.35, V$

B) $+, 0.35, V$

C) $+, 1.17, V$

D) $-, 1.17, V$

Show Answer

Answer:

Correct Answer: B

Solution:

In this reaction $F e^{2 +} + \overset{0}{Z n}, \to \overset{2 +}{Z n}, + \overset{0}{F e},$ $E M F = E_{c a t h o d e} - E_{a n o d e}$ $= - 0.41 - (- 0.76)$ $E M F = + 0.35$ V.

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Redox Reactions And Electrochemistry Ques 87

Question: The standard reduction potential NaCl for the half reactions are as Zn=Zn2++2e−;Eo=+0.76,V Fe=Fe2++2e−;Eo=+0.41,V The EMF for cell reaction Fe2++Zn,→,Zn2++Fe is [IIT 1988; CBSE PMT 1993, 96; BHU 1995, 2000; CPMT 2000; KCET 2000; AIIMS 2001; Orissa JEE 2002]

Options:

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