UPSC Combined Geo-Scientist, Mains · 2017 · Mains Paper I
Q10(a). Why NH₄Cl/NH₄OH cannot be replaced by NaCl/NaOH in Group III
Question
NaCl and NaOH cannot be used in place of NH₄Cl and NH₄OH for the precipitation of Group IIIA metal ions in qualitative group analysis. Provide an explanation.
Model answer
The free solution for 2017 answers questions 1, 2, 4, 7, 8 and 11, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.
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Coversqualitative analysisgroup IIIcommon ion effectNH4Cl NH4OH buffer
All parts of Question 10
- 10(a) Why NH₄Cl/NH₄OH cannot be replaced by NaCl/NaOH in Group III10 marks
- 10(b) Nuclear stability and packing fraction10 marks
- 10(c) Weak, sharp absorption bands of lanthanides10 marks