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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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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Hints

In the equation,

NO2- +  H2NO3- + 2H+ + ne-

n represents

1. 5

2. 1

3. 2

4. 3

Subtopic:  Oxidizing & Reducing Agents |
 75%
From NCERT
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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%
From NCERT
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Reaction between acidified K2Cr2O7 and iron (II) ions shown by the equation:

Cr2O72-(aq) + 6Fe2+(aq) +14H+(aq)2Cr3+(aq) + 7H2O(l) + 6Fe3+(aq)

The correct statement among the following is -

1. Colour of the solution changes from green to blue

2. Iron (II) ions are reduced 

3. Dichromate ions are reduced 

4. Hydrogen ions are reduced

Subtopic:  Oxidizing & Reducing Agents |
 78%
From NCERT
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The oxidation number of carbon in C3O2  and Mg2C3 are respectively:

1. -4/3, +4/3 

2. +4/3, -4/3

3. -2/3, +2/3

4. -2/3, +4/3

Subtopic:  Oxidizing & Reducing Agents |
 89%
From NCERT
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Which metal exhibits more than one oxidation states?

1. Na

2. Mg

3. Al

4. Fe

Subtopic:  Introduction to Redox and Oxidation Number |
 83%
From NCERT
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The decomposition of KClO3 to KCl and O2 on heating is an example of:

1. intermolecular redox change

2. intramolecular redox change

3. disproportionation or auto redox change

4. none of the above

Subtopic:  Oxidizing & Reducing Agents |
 56%
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Among the following, In which iron has the lowest oxidation state?

1. Fe(CO)5

2. Fe2O

3. K4Fe(CN)6

4. FeSO4.(NH4)2SO4.6H2O

Subtopic:  Oxidizing & Reducing Agents |
 78%
From NCERT
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