Organic Chemistry Multiple Choice Questions and Answers – Redox Reactions

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Questions
1 KMnO4 reacts with oxalic acid according to the equation given below. Here 20 mL of 0.1 M KMnO4 is equivalent to how many mL and molarity of H2C2O4?

Organic Chemistry

A 20 mL of 0.5 M H2C2O4
B 50 mL of 0.5 M H2C2O4
C 50 mL of 0.1 M H2C2O4
D 20 mL of 0.1 M H2C2O4

Answer: 50 mL of 0.1 M H2C2O4
2 Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statement is incorrect for this reaction?
A Na2S2O3 is oxidized
B CuI2 is formed
C Cu2I2 is formed
D Evolved I2 is reduced

Answer: CuI2 is formed
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3 How many number of moles of KMnO4 will react with 180 gm H2C2O4 according to given reaction?

KMnO4 + H2C2O4 → 2C02 + Mn2+

A 4/5
B 2/5
C 1/5
D 4/3

Answer: 4/5
4 What is the mass of K2Cr2O7 required to produce 254 gm I2 from KI solution? Given: K2Cr2O7 + 2KI → 2Cr3+ + I2
A 49 g
B 98 g
C 9.8 g
D 4.9 g

Answer: 98 g
5  What is the volume of 0.05 M KMnO4 which will react with 50 ml of 0.1 M H2S in acidic medium (H2S → S02)?
A 60 ml
B 6 ml
C 12 ml
D 120 ml

Answer: 120 ml
6 What is the mass of Fe304 if it reacts completely with 25 ml of 0.3m K2Cr2O7?
A 1 .44 g
B 10.44 g
C 104.4 g
D 14.4 g

Answer: 10.44 g
7 What is the concentration of H2O2 solution of 20 ml of H2O2 solution which will react completely with 10 ml of 2 M KMnO4 in acidic medium?
A 1.25 M
B 5 M
C 2.5 M
D 25 M

Answer: 2.5 M
8 How many moles of KCI are required to produce 10 mol Cl2 by the reaction with KCIO3?
A 1.66 mole
B 13.33 mole
C 0.66 mole
D 16.66 mole

Answer: 16.66 mole
9

How many moles of KMnO4 are required for complete oxidation of 1.25 mol Cu2S?

Cu2S → Cu+2 + SO2

A 1 mole
B 3 moles
C 2 moles
D 5 moles

Answer: 2 moles
10 What is the volume strength of H2O2 of its 11.2 ml requires 30 ml of 0.5 M 2Cr2O7?
A 35
B 55
C 25
D 45

Answer: 45

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