UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper I
Q4(b). Why Cr(III) cannot be titrated directly with EDTA
Question
The log K value of Cr–EDTA complex is 23.0, still Cr(III) cannot be titrated with EDTA directly. Explain.
Model answer
The free solution for 2016 answers questions 1, 3, 5, 6, 9 and 10, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.
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.
CoversCr-EDTAkinetic inertnessback titrationEDTA titration
All parts of Question 4
- 4(a) Crystal field splitting in octahedral and tetrahedral fields15 marks
- 4(b) Why Cr(III) cannot be titrated directly with EDTA5 marks
- 4(c) Structure and bonding in Fe₃(CO)₁₂10 marks