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 |
 53%
From NCERT
AIPMT - 2011
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Standard reduction potentials of the half-reactions are given below: 

F2(g)F2(g) ++ 2e-2F-(aq)2e2F(aq) ;; E°E° =+2.85=+2.85 VV 

Cl2(g)Cl2(g) ++ 2e-2Cl-(aq)2e2Cl(aq) ;; E°E° =+1.36=+1.36 VV 

Br2(g)Br2(g) ++ 2e-2Br-(aq)2e2Br(aq) ;; E°E° =+1.06=+1.06 VV 

I2(g)I2(g) ++ e-2I-(aq)e2I(aq) ;; E°E° =+0.53=+0.53 VV 

The strongest oxidizing and reducing agents, respectively, are: 

1. Br2Br2 and Cl-Cl

2. Cl2Cl2 and Br-Br

3. Cl2Cl2 and I2I2

4. F2F2 and l-l

Subtopic:  Emf & Electrode Potential |
 85%
From NCERT
AIPMT - 2012
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a Zn + b NO3- + cH+ → d NH4+ + e H2O + f Zn+2 
In the reaction given above, the correct values of a, b, c, d, e, and f respectively are: 
a b c d e f
1. 2 4 6 8 4 2
2. 1 4 10 3 1 4
3. 4 1 10 1 3 4
4. 10 4 1 3 4 2
Subtopic:  Balancing of Equations |
 71%
From NCERT
AIPMT - 1999
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Best description of the behavior of bromine in the reaction given below is:

H2O+Br2HOBr+HBrH2O+Br2HOBr+HBr

1. Both oxidized and reduced

2. Oxidized only

3. Reduced only

4. Proton acceptor only

Subtopic:  Introduction to Redox and Oxidation Number |
 86%
From NCERT
AIPMT - 2004
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If the oxidation numbers of A, B, and C are + 2, +5, and –2 respectively, then the possible formula of the compound is:

1. A2(BC2)2 2. A3(BC4)2
3. A2(BC3)2 4. A3(B2C)2
Subtopic:  Oxidizing & Reducing Agents |
 72%
From NCERT
AIPMT - 2000
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A non-feasible reaction among the following is:

1. 22 KI+Br22KBr+I2KI+Br22KBr+I2

2. 22 KBr+I22KI+Br2KBr+I22KI+Br2

3. 22 KBr+Cl22KCl+Br2KBr+Cl22KCl+Br2

4. 2H2O+2F24HF+O22H2O+2F24HF+O2

Subtopic:  Introduction to Redox and Oxidation Number |
 61%
From NCERT
AIPMT - 2002
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Standard electrode potentials are:

Fe+2/FeFe+2/Fe ,E°E° == -0.44 0.44 

 Fe+3/Fe+2 ,E° Fe+3/Fe+2 ,E° =0.77=0.77

Choose the correct observation when Fe+2,Fe+2, Fe+3Fe+3, and Fe (solid) are kept together:

1. Fe+3Fe+3 increases 

2. Fe+3Fe+3 decreases 

3. Fe+2Fe+3Fe+2Fe+3 remains unchanged 

4. Fe+2Fe+2 decreases

Subtopic:  Application of Electrode Potential | Emf & Electrode Potential |
 66%
From NCERT
AIPMT - 2001
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The oxidation states(O.S.) of sulphur in the anions SO32-,SO32, S2O42-S2O42 andand S2O62- follow the order:

1. S2O42-<SO32-<S2O62-

2. SO32-<S2O42-<S2O62-

3. S2O42-<S2O62-<SO32-

4. S2O62-<S2O42-<SO32-

Subtopic:  Oxidizing & Reducing Agents |
 74%
From NCERT
AIPMT - 2003
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From the following, identify the reaction having the top position in the EMF series (standard reduction potential) according to their electrode potential at 298 K.

1. Mg2++ 2eMg(s)
2. Fe2+ + 2e Fe(s)
3. Au3++ 3eAu(s)
4. K++ le K(s)

Subtopic:  Application of Electrode Potential |
From NCERT
NEET - 2020
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The incorrect oxidation number of the underlined atom in the following species is:

1. Cu2O is -1 2. ClO3 is +5
3. K2Cr2O7 is +6 4. HAuCl4  is +3
Subtopic:  Oxidizing & Reducing Agents |
 80%
From NCERT
NEET - 2020
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