The standard electrode potentials of Zn and Ni are respectively - 0.76 V and - 0.25 V. Then the standard emf of the spontaneous cell by coupling these under standard conditions is

Question

The standard electrode potentials of Zn and Ni are respectively - 0.76 V and - 0.25 V. Then the standard emf of the spontaneous cell by coupling these under standard conditions is (A) + 1.01 V (B) - 0.51 V (C) + 0.82 V (D) + 0.25 V

Tardigrade Admin · Accepted Answer

The standard electrode potential of Zn(E° textanode)=-0.76 V The standard electrode potential of text Ni (E° text cathode)=-0.25 From equation E text cell ° =E text (cathode) °-E° text (anode) =-0.25-(-0.76)=+0.51 V

Q. The standard electrode potentials of $Z n$ and $N i$ are respectively $- 0.76 V$ and $- 0.25 V$ . Then the standard emf of the spontaneous cell by coupling these under standard conditions is

$+ 1.01 V$

$- 0.51 V$

$+ 0.82 V$

$+ 0.25 V$

$+ 0.51 V$

The standard electrode potential of

$Z n (E_{anode}^{\circ}) = - 0.76 V$

The standard electrode potential of

$Ni (E_{cathode}^{\circ}) = - 0.25$

From equation

$E_{cell}^{\circ} = E_{(cathode)}^{\circ} - E^{\circ} (anode)$

$= - 0.25 - (- 0.76) = + 0.51 V$

Q. The standard electrode potentials of Zn and Ni are respectively −0.76V and −0.25V. Then the standard emf of the spontaneous cell by coupling these under standard conditions is

+1.01V

−0.51V

+0.82V

+0.25V

+0.51V

The standard electrode potential of Zn(Eanode∘​)=−0.76V The standard electrode potential of Ni (Ecathode∘​)=−0.25 From equation Ecell ∘​=E(cathode) ∘​−E∘ (anode) =−0.25−(−0.76)=+0.51V