Question

What is the standard reduction potential value of potassium in the EMF series?

(a) +0.337 V

(b) -2.925 V

(c) -0.763 V

(d) -1.662 V

This question was posed to me in an online interview.

My query is from Eight Forms topic in chapter Eight Forms of Corrosion of Corrosion Engineering

Answer 1

Right option is (b) -2.925 V

For explanation: Standard reduction potential values of metal are measured against SHE, which is arbitrarily defined as zero. Standard reduction potential of potassium (K-K^+), aluminum (Al-Al^+3), zinc (Zn-Zn^+2), copper (Cu-Cu^+2) are –2.925V, -1.662V, -0.763V and +0.337V respectively.