Question

Arrange the following in the order of their decreasing electrode potentials :Mg, K, Ba,Ca

• A. K,Ba,Ca,Mg
• B. Ba,Ca,K,Mg
• C. Ca,Mg,K,Ba
• D. Mg,Ca,Ba,K

Answer 1

The correct option is D Mg,Ca,Ba,K

To find electrode potential, electrochemical series is used.

So, electrode potential order (according to the electrochemical series is)
$Mg>Ca>Ba>K$

Hence, option D is correct.