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Organic Chemistry Multiple Choice Questions and Answers – Redox Reactions

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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?

[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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