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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper II covers physical chemistry.

UPSC Combined Geo-Scientist, Mains · 2023 · Mains Paper II

Q6(b). Types of reversible electrodes

Question

Match the following (reversible electrode with example): (i) Metal–metal ion, (ii) Redox, (iii) Metal–insoluble, (iv) Gas, (v) Non-metal; with 1. Pt | I₂(s) | I⁻(aq), 2. Pt | H₂(g) | H⁺(aq), 3. Pt | MnO₄⁻, Mn²⁺(aq), 4. Ag | AgCl(s) | Cl⁻(aq), 5. Hg₂²⁺ | Hg.

Answer in brief

(i)–5, (ii)–3, (iii)–4, (iv)–2, (v)–1.

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Coversreversible electrodesmetal–metal ion electroderedox electrodesilver–silver chloride electrodegas electrode

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