# 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. $2$ $\mathrm{KI}+{\mathrm{Br}}_{2}\to 2\mathrm{KBr}+{\mathrm{I}}_{2}$

2. $2$ $\mathrm{KBr}+{\mathrm{I}}_{2}\to 2\mathrm{KI}+{\mathrm{Br}}_{2}$

3. $2$ $\mathrm{KBr}+{\mathrm{Cl}}_{2}\to 2\mathrm{KCl}+{\mathrm{Br}}_{2}$

4. $2{\mathrm{H}}_{2}\mathrm{O}+2{\mathrm{F}}_{2}\to 4\mathrm{HF}+{\mathrm{O}}_{2}$

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

$F{e}^{+2}/Fe$ ,$E°$ $=$

$=0.77$

Choose the correct observation if $F{e}^{+2},$ $F{e}^{+3}$, and Fe  block are kept together:

1. $F{e}^{+3}$ increases

2. $F{e}^{+3}$ decreases

3. $\frac{F{e}^{+2}}{F{e}^{+3}}$ remains unchanged

4. $F{e}^{+2}$ 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 ${{\mathrm{SO}}_{3}}^{2-},$ ${\mathrm{S}}_{2}{{\mathrm{O}}_{4}}^{2-}$ $\mathrm{and}$ ${\mathrm{S}}_{2}{{\mathrm{O}}_{6}}^{2-}$ follow the order:

1. ${\mathrm{S}}_{2}{{\mathrm{O}}_{4}}^{2-}<{{\mathrm{SO}}_{3}}^{2-}<{\mathrm{S}}_{2}{{\mathrm{O}}_{6}}^{2-}$

2. ${{\mathrm{SO}}_{3}}^{2-}<{\mathrm{S}}_{2}{{\mathrm{O}}_{4}}^{2-}<{\mathrm{S}}_{2}{{\mathrm{O}}_{6}}^{2-}$

3. ${\mathrm{S}}_{2}{{\mathrm{O}}_{4}}^{2-}<{\mathrm{S}}_{2}{{\mathrm{O}}_{6}}^{2-}<{{\mathrm{SO}}_{3}}^{2-}$

4. ${\mathrm{S}}_{2}{{\mathrm{O}}_{6}}^{2-}<{\mathrm{S}}_{2}{{\mathrm{O}}_{4}}^{2-}<{{\mathrm{SO}}_{3}}^{2-}$

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:

${\mathrm{H}}_{2}\mathrm{O}+{\mathrm{Br}}_{2}\to \mathrm{HOBr}+\mathrm{HBr}$

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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