MCQ
The standard electrode potential for the two electrode ${A^ + }/A$ and ${B^ + }/B$ are respectively $0.5$ $V$ and $0.75$ $V$. The $emf$ of the given cell $A\,\,|\,\,{A^ + }(a = 1)\,\,||\,\,{B^ + }(a = 1)\,\,|\,\,B$ will be ........... $\mathrm{V}$
- A$1.25 $
- B$-1.25$
- C$-0.25$
- ✓$0.25$