(a) H2O2 + O3 → H2O + 2O2 

(b) H2O2 + Ag2O → 2Ag + H2O + O2 

The role of hydrogen peroxide in the above reactions is respectively:

1.  oxidizing in (a) and reducing in (b)
2.  reducing in (a) and oxidizing in (b)
3.  reducing in (a) and (b)
4.  oxidizing in (a) and (b)

Subtopic:  Oxidizing & Reducing Agents |
 52%
From NCERT
AIPMT - 2014
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The change in oxidation number of chlorine when Cl2 gas reacts with hot and concentrated sodium hydroxide solution is:

1. Zero to +1 and Zero to -5

2. Zero to -1 and Zero to +5

3. Zero to -1 and Zero to +3

4. Zero to +1 and Zero to -3

Subtopic:  Oxidizing & Reducing Agents |
 69%
From NCERT
AIPMT - 2012
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The highest oxidation number of nitrogen among the following compounds is:

1. N2H4

2. NH3

3. N3H

4. NH2OH

Subtopic:  Oxidizing & Reducing Agents |
 62%
From NCERT
AIPMT - 2012
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A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?Redox Reactions

1. S

2. H

3. Cl

4. C

Subtopic:  Oxidizing & Reducing Agents |
 67%
AIPMT - 2012
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Standard reduction potentials of the half-reactions are given below: 

F2(g) + 2e-2F-(aq) ; E° =+2.85 V 

Cl2(g) + 2e-2Cl-(aq) ; E° =+1.36 V 

Br2(g) + 2e-2Br-(aq) ; E° =+1.06 V 

I2(g) + e-2I-(aq) ; E° =+0.53 V 

The strongest oxidizing and reducing agents, respectively, are: 

1. Br2 and Cl-

2. Cl2 and Br-

3. Cl2 and I2

4. F2 and l-

Subtopic:  Emf & Electrode Potential |
 84%
From NCERT
AIPMT - 2012
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A solution contains Fe2+, Fe3+ and I ions. This solution was treated with iodine at 35°C. E° for Fe3+/Fe2+ is +0.77 V and E° for I2/2I = 0.536 V.
The favourable redox reaction is:

1. Fe2+ will be oxidized to Fe3+

2. I2 will be reduced to I

3. There will be no redox reaction

4. I will be oxidized to I2

Subtopic:  Emf & Electrode Potential |
 51%
From NCERT
AIPMT - 2011
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Oxidation numbers of P in PO43-, of S in SO42- and that of Cr in Cr2O72-are respectively:
1. +5, +6 and +6
2. +3, +6 and +5
3. +5, +3 and +6
4. -3, +6 and +6

Subtopic:  Oxidizing & Reducing Agents |
 90%
From NCERT
AIPMT - 2009
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 FeCN64-FeCN63-+e-; Eo=-0.35 V
Fe2+Fe3++e-; Eo=-0.77 V
The strongest oxidizing agent in the above equation is:

1. FeCN64-

2. Fe2+

3. Fe3+

4. FeCN63-

Subtopic:  Emf & Electrode Potential |
From NCERT
AIPMT - 2008
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Number of moles of \(MnO^-_4\) required to oxidise one mole of ferrous oxalate completely in an acidic medium will be:

1. 0.6 mole 2. 0.4 mole
3. 7.5 moles 4. 0.2 mole
Subtopic:  Balancing of Equations |
 58%
From NCERT
AIPMT - 2008
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The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in an acidic solution is:

1. \(3 \over 5\) 2. \(4 \over 5\)
3. \(2 \over 5\) 4. 1
Subtopic:  Equivalent Weight |
 60%
From NCERT
AIPMT - 2007
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