Question

Among the following, the element having the highest value for electrochemical equivalent is:

• A. $Na$
• B. $K$
• C. $Ca$
• D. $Mg$

Answer 1

Answer: (B)

$K$

Electro-chemical equivalent $=\frac{molecularweight}{charge}$
For the given options, the electro-chemical equivalents are as follows:

$Na=\frac{23}{1},K=\frac{38}{1},Ca=\frac{40}{2}=20,Mg=\frac{24}{2}=12$

$\therefore$ $K$ has the highest electrochemical equivalent.