Question

$K,$ $Ca$ and $Li$ metals may be arranged in the decreasing order of their standard electrode potentials as.

• A. $K,$ $Ca,$ $Li$
• B. $Li,$ $K,$ $Ca$
• C. $Li,$ $Ca,$ $K$
• D. $Ca,$ $Li,$ $K$

Answer 1

Answer: (B)

$Li,$ $K,$ $Ca$

Answer 2

$Li^{+} + e^{-} \rightarrow Li$, $E^{o} = - 3.05\mspace{6mu} V$

$K^{+} + e^{-} \rightarrow K$, $E^{o} = - 2.93\mspace{6mu} V$

$Ca^{+ 2} + 2e^{-} \rightarrow Ca$, $E^{o} = - 2.87\mspace{6mu} V$