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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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%
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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 |
 90%
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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 |
 84%
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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 |
 57%
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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%
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Reducing agent among the following is -

1. HNO3 2. KMnO4
3. H2SO4 4. (COOH)2
Subtopic:  Oxidizing & Reducing Agents |
 64%
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The equivalent mass of a reductant or an oxidant is given by:

1. Eq. mass = molar mass of reductant or oxidantno. of electrons lost or gained by 1 molecule of reductant or oxidant

2. Eq. mass = molar massvalence

3. Eq. mass = molar masstotal charge on cation or anion

4. All of the above

Subtopic:  Equivalent Weight |
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NaH+ H2NaOH + H2:

The correct statement for above mentioned reaction among the following is-

1. H- is oxidised

2. Nais reduced

3. Both NaH and H2O are reduced 

4. None of the above

Subtopic:  Oxidizing & Reducing Agents |
 68%
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