Q8(b). Ordering reducing strength
Following are the standard redox potentials for the reactions in aqueous media: Ag²⁺ + e⁻ ⇌ Ag⁺, +1.98 V; Mg²⁺ + 2e⁻ ⇌ Mg, −2.37 V; Li⁺ + e⁻ ⇌ Li, −3.04 V; Ca²⁺ + 2e⁻ ⇌ Ca, −2.87 V; Na⁺ + e⁻ ⇌ Na, −2.71 V. Arrange the above metals in the order of their increasing reducing power.
Model answer
The free solution for 2024 answers questions 1, 2, 5, 6, 9 and 11, the ones picked in its time plan. Question 8 is answered in full in the Geo-Scientist Chemistry Paper I, 2021 to 2025 book, with every part of every paper.
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UPSC Combined Geo-Scientist (Main) Chemistry Paper I: Model Answers 2021 to 2025
- All eleven questions of each paper, with the question printed above its answer
- Titration, gravimetric and nuclear numericals worked with units; structures drawn
- Topic-wise weightage and a topic-wise index
Coversreducing powerstandard reduction potentialelectrochemical serieslithium strongest reductant
All parts of Question 8
- 8(a) Completing useful redox equations15 marks
- 8(b) Ordering reducing strength5 marks
- 8(c) Redox-indicator transition potential10 marks