VKC ScienceChemistry for written exams Telegram

UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper I

Q6(c). Iron–hydrogen cell

Question

Write oxidation half reaction and reduction half reaction and calculate EMF of the following cell at 298 K: Fe(s)/Fe²⁺(aq)(0.001 M)//H+(aq)(1 M)/H₂(g)(1 atm),Pt. Standard reduction potentials of Fe²⁺/Fe = -0.44 V and H+/1/2H₂ = 0.0 V.

Answer in brief

The cell EMF is approximately 0.529 V under the stated concentration approximation.

Part of VKC Basic

Read the key points and the full model answer with VKC Basic

VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.

See what is included Already a member? Sign in

The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

The handwritten model answer pages open with the VKC plan.
Read the whole 2018 solution2018 question paper

CoversIron–hydrogen cellNernst equation

All parts of Question 6