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Q.

The following are some statements about normal hydrogen electrode
A) when a ‘Zn’ electrode is in combination of NHE, Zn electrode acts as cathode
B) when a ‘Cu’ electrode is in combination with NHE, Cu electrode is the anode
C) when a ‘Ag’ electrode is in combination with NHE, Ag electrode is the anode
D) when a chlorine electrode is in combination with NHE, chlorine electrode is the anode

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a

only 1 is correct

b

both 2 & 3 correct

c

all are incorrect

d

all are correct

answer is C.

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Detailed Solution

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When Zn & NHE ; Zn acts as anode ( so statement ‘a’ is incorrect ) 

When Cu & NHE ; Cu acts as cathode ( so statement ‘b’ is incorrect)

When Ag & NHE ; Ag acts as cathode ( so statement ‘ c’ incorrect ) 

When Cl2 & NHE ; Cl2 acts as cathode ( so statement ‘d’ is incorrect )  

all statements are incorrect .

 

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The following are some statements about normal hydrogen electrodeA) when a ‘Zn’ electrode is in combination of NHE, Zn electrode acts as cathodeB) when a ‘Cu’ electrode is in combination with NHE, Cu electrode is the anodeC) when a ‘Ag’ electrode is in combination with NHE, Ag electrode is the anodeD) when a chlorine electrode is in combination with NHE, chlorine electrode is the anode