1. Tardigrade
  2. Question
  3. Chemistry
  4. How many of the following are the CORRECT expressions to calculate e.m.f. of the cell? i. E text cell =E text oxi (anode) +E text red (cathode) ii. E text cell =E text red (anode) -E text red (cathode) iii. E text cell =E text oxi (anode) -E text oxi (cathode) iv. E text cell =E text red (cathode) -E text red (anode) v. E text cell =E text red (cathode) +E text red (anode) vi. E text cell =E text oxi (anode) +E text oxi (cathode)

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Q. How many of the following are the CORRECT expressions to calculate e.m.f. of the cell?
i. $ E_{\text {cell }}=E_{\text {oxi }}$ (anode) $+E_{\text {red }}$ (cathode)
ii. $E_{\text {cell }}=E_{\text {red }}$ (anode) $-E_{\text {red }}$ (cathode)
iii. $E_{\text {cell }}=E_{\text {oxi }}$ (anode) $-E_{\text {oxi }}$ (cathode)
iv. $E_{\text {cell }}=E_{\text {red }}$ (cathode) $-E_{\text {red }}$ (anode)
v. $E_{\text {cell }}=E_{\text {red }}$ (cathode) $+E_{\text {red }}$ (anode)
vi. $E_{\text {cell }}=E_{\text {oxi }}$ (anode) $+E_{\text {oxi }}$ (cathode)

Electrochemistry

Solution:

Expressions $(i), (iii)$ and $(iv)$ are the correct expressions to calculate e.m.f. of the cell.