Worksheetsredox titration
Total questions: 10
Worksheet time: 7mins
Which of the following is not an oxidising agent?
potassium permanganate
Oxalic acid
potassium dichromate
potassium iodate
Why KMnO4 is not a primary standard?Tick the suitable options
Not available in high purity form
hygroscopic
Its aqueous solution decomposes on standing as it is reduced by traces of organic matter.
Decomposes on exposure to sunlight
All of the above
Name the acid used in permanganometric titration.
dil sulphuric acid
dil hydrochloric acid
dil. nitric acid
Why oxalic acid solution is warmed along with dilute H2SO4 in permanganometric titration.
to trigger the reaction
Heating removes all dissolved CO2 out of the solution driving the reaction in forward direction
removes the catalyst Mn2+ produced and hence smoothen the further titration
All of the above
What is the stoichiometric ratio in titration of K2Cr2O7 vs Fe2+
1/6
6/1
1/5
5/1
Select the external indicator used in dichrometry.
N-phenyl anthranilic acid
Sodium diphenylamine sulphonate
Potassium ferrocyanide
Potassium ferricyanide
The direct titration of a reducing agent with a standard solution of iodine is called iodimetry.
True
False
Select the commonly used reducing agents in iodimetry
hypo
arsenious oxide
sodium sulpahate
sodium arsenite
The choice of the indicator is such that EIn0 is closer to the Eo at the equivalence point of titration
True
False
Select the redox indicators and its colour change .
N-phenyl anthranilic acid, Violet red to colurless
Mureoxide ,red to colurless
Diphenyl amine ,blue to colourless
Diphenyl amine,violet to colourless
