Question

Use the standard electrode potentials for elements A, B, C, D and F given below to answer the questions that follow.

1. Which element is likely to be hydrogen? Give a reason for your answer. 
2. What is E^θ of the strongest reducing agent?
3. Calculate the e.m.f of the cell that would be formed when half cells of B and D are combined.

Answer 1

1. Which element is likely to be hydrogen? Give a reason for your answer.
   • It has an E^θ of zero // Being used as the standard electrode.
2. What is E^θ of the strongest reducing agent? 
   • -290V  Reject A or A²⁺
3. Calculate the e.m.f of the cell that would be formed when half cells of B and D are combined. 
   • E_cell = E_red – E_ox
     = +0.34 - -2.38
     = +2.72V

Answer 2

C
A
-2.38

Answer 3

A