JEE Main 2021 | सदिश बीजगणित - L4 | vector algebra | Hindi Medium | Amar Sir | 8 PM

1 PM JEE Mains 2020 - Maths | Vectors and 3D Geometry By Shahid Sir | JEE Score Booster Course

4 PM JEE Mains 2020 - Maths | Definite Integration By Shahid Sir | JEE Score Booster Course

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JEE Mains & Advanced | Chemistry - Ideal Gases By Vipin Sir | L4 English Medium

JEE Mains & Advanced | Chemistry - Ideal Gases By Vipin Sir | L3 English Medium

JEE Mains & Advanced | Chemistry - Ideal Gases By Vipin Sir | L1 English Medium

JEE Mains & Advanced | Chemistry - Ideal Gases By Vipin Sir | L2 English Medium

KMnO_4 is prepared from the mineral pyrolusite, MnO_2 (deep purple colour). It acts as an oxidising agent in the neutral, alkaline as well as acidic medium in acidic medium it is used in volumetric analysis for estimation of Fe^(2+) , Cr_2O_4^(2-) salts etc. The titrations are carried out in presence of H_2SO_4 . However, before using it as a titrant, it is first standardised with standard oxalic acid solution or Mohr's salt solution . In one of the experiments on titration 26.8g of dry pure sodium oxalate (Mw=123gmol^-1) was dissolved in 1L of distilled water and then 100 mL of 2MH_2SO_4 were added. The solution was cooled. Now to this solution 0.1MKMnO_4 solution was added till a very faint pink colour persisted. Q. Mohr's salt, FeSO_4(NH_4)_2SO_46H_2O , is preffered over FeSO_4.7H_2O for standardisation of KMnO_4 solution because.