The reaction involving the transfer of five electrons is -

1. MnO4-  Mn2+

2. CrO42- Cr3+

3. MnO4-  MnO2

4. Cr2O72- 2Cr3+

Subtopic:  Oxidizing & Reducing Agents |
 83%
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In the reaction;

2Ag + 2H2SOAg2SO4 + 2H2O + SO2, H2SO4 acts as:

1. Oxidizing agent

2. Reducing agent

3. Dehydrating agent

4. None of the above

Subtopic:  Balancing of Equations |
 74%
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Which of the following shows the highest oxidation number in the combined state?

1. Os

2. Ru

3. Xe

4. All of the above

Subtopic:  Oxidizing & Reducing Agents |
 61%
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Equation that does not represent a redox reaction is-

1. BaO2 + H2SO4 BaSO4 +  H2O

2. 2BaO + O2  2BaO

3. 2KClO3 →2KCl + 3O2 

4. SO2 + 2H22H2O + 3S

Subtopic:  Oxidizing & Reducing Agents |
 53%
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In the preparation of chlorine from HCl;  MnO2 acts as:

1. Reducing agent

2. Oxidising agent

3. Catalytic agent

4. Dehydrating agent

Subtopic:  Oxidizing & Reducing Agents |
 68%
From NCERT
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In which reaction H2O2 acts as a reducing agent?

1. Ag2O + H2O2 2Ag + H2O + O2

2. 2KI + H2O2KOH + I2

3. PbS + 4H2OPbSO4 + 4H2O2

4. H2O+ SO2  H2SO4

Subtopic:  Oxidizing & Reducing Agents |
 69%
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Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statement is incorrect in this reaction?

1. Evolved I2 is reduced

2. CuI2 is formed

3. Na2S2O3 is oxidised

4. Cu2I2 is formed

Subtopic:  Oxidizing & Reducing Agents |
 50%
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In the equation,

NO2- +  H2NO3- + 2H+ + ne-

n represents

1. 5

2. 1

3. 2

4. 3

Subtopic:  Oxidizing & Reducing Agents |
 75%
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Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl:

1. oxidises oxalic acid to carbon dioxide and water

2. gets oxidised by oxalic acid to chlorine

3. furnishes H+ ions in addition to those from oxalic acid

4. reduces permanganate to Mn2+

Subtopic:  Redox Titration & Type of Redox |
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KMnO4 in acidic medium is always reduced to:

1. Mn4+ 

2. Mn2+ 

3. Mn6+

4. Mn

Subtopic:  Oxidizing & Reducing Agents |
 85%
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