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. 2 KI+Br22KBr+I2

2. 2 KBr+I22KI+Br2

3. 2 KBr+Cl22KCl+Br2

4. 2H2O+2F24HF+O2

Subtopic:  Introduction to Redox and Oxidation Number |
 60%
From NCERT
AIPMT - 2002
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Standard electrode potentials are:

Fe+2/Fe , E° = -0.44 

 Fe+3/Fe+2 ,E° = 0.77

Choose the correct observation if Fe+2, Fe+3, and Fe  block are kept together:

1. Fe+3 increases 

2. Fe+3 decreases 

3. Fe+2Fe+3 remains unchanged 

4. Fe+2 decreases

Subtopic:  Application of Electrode Potential | Emf & Electrode Potential |
 65%
From NCERT
AIPMT - 2001
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The oxidation states(O.S.) of sulphur in the anions SO32-, S2O42- and S2O62- follow the order:

1. S2O42-<SO32-<S2O62-

2. SO32-<S2O42-<S2O62-

3. S2O42-<S2O62-<SO32-

4. S2O62-<S2O42-<SO32-

Subtopic:  Oxidizing & Reducing Agents |
 72%
From NCERT
AIPMT - 2003
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Best description of the behavior of bromine in the reaction given below is:

H2O+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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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 |
 70%
From NCERT
AIPMT - 1999
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The compound that contains zero oxidation state of Fe is:

1. [Fe(CN)6]-4 2. [Fe(CN)6]-3
3. Fe(CO)5 4. All of the above.
Subtopic:  Oxidizing & Reducing Agents |
 84%
From NCERT
AIPMT - 1999
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