36 Questions
What is the role of iodine in iodimetric titrations?
Oxidising agent
In which type of medium is potassium permanganate commonly used?
Acidic medium
What is the difference between iodimetric and complexometric titrations?
Iodimetric titrations involve precipitation, while complexometric titrations involve complex formation.
What is the role of EDTA in complexometric titrations?
As a complexing agent
What is the advantage of complexometric titrations over precipitation titrations?
There is no error due to co-precipitation
Which type of titrations involves the formation of insoluble precipitates?
Precipitation titrations
What is the purpose of maintaining an acidic medium in dichromate titrations?
To facilitate the reaction between potassium dichromate and the analyte
What is the primary use of potassium permanganate in titrations?
Estimation of ferrous salts and oxalic acid
What is the characteristic of the solution of potassium dichromate?
It can be directly used for titrations
What occurs in iodimetric and iodometric titrations?
Both oxidation of iodide ions to free iodine and reduction of free iodine to iodide ions
What is the role of potassium ferricyanide in dichromate titrations?
It acts as an external indicator
What is the advantage of using potassium permanganate in titrations?
It is a self-indicator and produces a distinct colour change
What is the purpose of using potassium iodide in iodometric titrations?
To liberate free iodine from an oxidising agent
In which type of medium is the reaction between potassium iodide and an oxidising agent usually carried out?
Neutral medium
What is the purpose of titrating free iodine with sodium thiosulphate in iodometric titrations?
To estimate the concentration of the oxidising agent
Which of the following can be estimated using potassium permanganate as an oxidising agent?
Sulphite and thiosulphate
What is the role of phenolphthalein in titrations?
To act as an indicator in titrations of strong alkalies
What type of titrations involve the use of an oxidising agent to react with potassium iodide?
Iodometric titrations
What is the equivalent mass of H2SO4 in the reaction 2 NaCl + H2SO4 → Na2SO4 + 2 HCl?
49.0
What is the molarity of a solution containing 60 g of NaOH in 1 liter of solution?
1 M
What is the number of milli-equivalents of 0.5 g of H2C2O4.2H2O?
7.94
What is the strength of a solution containing 40 g of NaOH in 1 liter of solution?
40 g/L
What is the equivalent mass of CH3COOH?
60.0
What is the number of moles of 0.126 g of H2C2O4.2H2O?
0.001
What is the equivalent mass of a substance if its molecular mass is 100 and it is 2 electron change?
50
What is the number of moles of NH3 produced when 1 mole of NH4Cl reacts with NaOH?
1
What is the molarity of a solution of CoCl2 if 1 litre of the solution contains 0.2 moles of CoCl2?
0.2 M
What is the strength of a solution of HCl if 10 ml of the solution reacts with 20 ml of 1M NaOH?
1 M
What is the equivalent mass of an acid if it donates 1 electron and its molecular mass is 80?
40
What is the number of milli-equivalents of NaOH required to react with 1 mole of NH4Cl?
5000
What is the equivalent mass of NaOH?
40 g
If the molecular mass of KMnO₄ is 158 g/mol, what is its equivalent mass in acidic medium?
31.6 g
What is the molarity of a solution of NaOH if 2.5 L of the solution contains 100 g of NaOH?
1.25 M
What is the normality of a solution of H₂SO₄ if 1 L of the solution contains 49 g of H₂SO₄?
2 N
What is the strength of a solution of NaOH if 1 L of the solution contains 40 g of NaOH?
400 g/L
If 25 mL of a NaOH solution reacts completely with 30 mL of a H₂SO₄ solution, what is the normality of the NaOH solution?
1 N
This quiz covers the principles and applications of redox titration using potassium permanganate. Learn about the estimation of ferrous salts, oxalic acid, and more. Test your knowledge of this important analytical technique.
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