MnO42- (1 mole ) in neutral aqueous medium is disproportionate to :

1. 2/3 mole of MnO4- and 1/3 mole of MnO2

2. 1/3 mole of MnO4- and 2/3 mole of MnO2

3. 1/3 mole of Mn2O7 and 1/3 mole of MnO2

4. 2/3 mole of Mn2O7 and 1/3 mole of MnO2

Subtopic:  Balancing of Equations | Redox Titration & Type of Redox |
 57%
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The oxidation number of oxygen in KO3 and Na2O2 is respectively -

1. 3, and 2
2. 1, and 0
3. 0, and 1
4. -0.33, and -1

 

Subtopic:  Oxidizing & Reducing Agents |
 86%
From NCERT
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The oxidation number of phosphorus in BaH2PO22 is-

1. -1

2. +1

3. +2

4. +3

Subtopic:  Oxidizing & Reducing Agents |
 69%
From NCERT
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2 mole of N2H4 loses 16 mole of electron is being converted to a new compound X. Assuming that all of the N appears in the new compound. What is the oxidation state of 'N' in X ?

1. -1

2. -2

3. +2

4. +4

Subtopic:  Equivalent Weight |
 53%
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When K2Cr2O7 is converted to K2CrO4, the change in the oxidation state of chromium is :

1. 0

2. 6

3. 4

4. 3

Subtopic:  Oxidizing & Reducing Agents |
 77%
From NCERT
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When a manganous salt is fused with a mixture of KNO3 and solid NaOH, the oxidation number of Mn changes from +2 to :

1. +4

2. +3

3. +6

4. +7

Subtopic:  Oxidizing & Reducing Agents |
From NCERT
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In FeII-MnO4- titration, HNO3, is not used because :

1. it oxidises Mn2+

2. it reduces MnO4-

3. it oxidises Fe2+

4. it reduces Fe3+ formed

Subtopic:  Oxidizing & Reducing Agents | Balancing of Equations |
 55%
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Which species are oxidized and reduced in the reaction ?

FeC2O4+KMnO4Fe3++CO2+Mn2+

1. Oxidised : Fe,C ; Reduced : Mn

2. Oxidised : Fe; Reduced : Mn

3. Reduced : Fe,Mn ; Oxidised : C

4. Reduced : C; Oxidised : Mn,Fe

 

Subtopic:  Oxidizing & Reducing Agents |
 66%
From NCERT
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Reaction that shows H2O2 as a reducing agent is -

1. SO2+H2O2H2SO4

2. 2KI+H2O22KOH+I2

3. PbS+4H2O2PbSO4+4H2O

4. Ag2O+H2O22Ag+H2O+O2

Subtopic:  Oxidizing & Reducing Agents |
 71%
From NCERT
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Following reaction describes the rusting of iron 

4Fe+3O24Fe3++6O2-

Which one of the following statement is incorrect ?

1. This is an example of a redox reaction

2. Metallic iron is reduced to Fe3+

3. Fe3+ is an oxidising agent

4. Metallic iron is a reducing agent

Subtopic:  Oxidizing & Reducing Agents |
 70%
From NCERT
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