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Which of the following will act as catho...

Which of the following will act as cathode when connected to standard hydrogen electrode which has `E^(@)` value given as zero ?
(i) `Zn^(2+)//Zn, E^(@)=-0.76V`
(ii) `Cu^(2+)//Cu, E^(@)=+0.34 V`
(iii) `Al^(3+)//Al, E^(@)=-1.66 V`
(iv) `Hg^(2+)//Hg, E^(@)=+0.885 V`

A

(i) and (ii)

B

(ii) and (iv)

C

(i) and (iii)

D

(i), (ii), (iii) and (iv)

Text Solution

Verified by Experts

The correct Answer is:
B
When the value of standard reduction potential is positive, the electrode undergoes reduction and acts as cathode.
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Can 1 M ZnSO_(4) be stored in a vessel made up of copper ? Given : E_(Zn^(2+)//Zn)^(@)=-0.76 " and "E_(Cu^(2+)//Cu)^(@)=+0.34" V" ?

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Copper from copper sulphate solution can be displacesd by. (The standard reduction potentials of some electrodes are given below): E^(o)(Fe^(2+)//Fe) = - 0.44 V, E^(o) (Zn^(2+)//Zn) = - 0.76 V E^(o) (Cu^(2+)//Cu) = + 0.34 V: E^(o)(Cr^(3+)//Cr) = - 0.74 V E^(o) (H^(+0)/H_(2)) = 0.00V

E_(Cu^(2+)//Cu)^(@)=0.34V E_(Cu^(+)//Cu)^(@)=0.522V E_(Cu^(2+)//Cu^(+))^(@)=

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