The oxidation number of phosphorus in Ba(H2PO2)2 is [Kurukshetra CEE 1998; DCE 2004]

(1) – 1

(2) + 1

(3) + 2

(4) + 3

Subtopic:  Oxidizing & Reducing Agents |
 67%
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When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]2,  MnO2,   Mn2O3,  Mn+2 then the number of electrons transferred in each case respectively is [AIEEE 2002]

(1) 4, 3, 1, 5

(2) 1, 5, 3, 7

(3) 1, 3, 4, 5

(4) 3, 5, 7, 1

Subtopic:  Application of Electrode Potential |
 84%
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For the redox reaction MnO4+C2O42+H+Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are [IIT 1988, 92; BHU 1995; CPMT 1997; RPMT 1999; DCE 2000; MP PET 2003]

 

MnO4  

C2O42  

H+

(1)  

 2

5

16

(2)

16

5

2

(3)

5

16

2

(4)

2

16

5

Subtopic:  Balancing of Equations |
 81%
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Which of the following is the strongest oxidising agent [Pb. CET 2000]

(1) BrO3/Br2+,Eo=+1.50

(2) Fe3+/Fe2+,Eo=+0.76

(3) MnO4/Mn2+,Eo=+1.52

(4) Cr2O72/Cr3+,Eo=+1.33

Subtopic:  Emf & Electrode Potential |
 79%
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Oxidation number of oxygen in potassium super oxide (KO2) is [UPSEAT 1999, 2002]

(1) – 2

(2) – 1

(3) – 1/2

(4) – 1/4

Subtopic:  Oxidizing & Reducing Agents |
 83%
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The compound YBa2Cu3O7 which shows superconductivity has copper in oxidation state ........ Assume that the rare earth element Yttrium is in its usual +3 oxidation state [IIT 1994]

(1) 3/7

(2) 7/3

(3) 3

(4) 7

Subtopic:  Balancing of Equations |
 84%
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In a balanced equation H2SO4+xHIH2S+yI2+zH2O, the values of x, y, z are

(1) x = 3, y = 5, z = 2

(2) x = 4, y = 8, z = 5

(3) x = 8, y = 4, z = 4

(4) x = 5, y = 3, z = 4

Subtopic:  Balancing of Equations |
 82%
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Which of the following pair is having different oxidation number of central atom?

(1) K2CrO4 ,K2Cr2O7

(2) H2SO4, H2SO5

(3) NH3, N3H

(4) All of these

Subtopic:  Introduction to Redox and Oxidation Number | Oxidizing & Reducing Agents |
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Which of the following is not a disproportionation reaction?

(1) H2S2O8H2SO4+O2

(2) P4H2OPH3+H3PO4

(3) H2SO5H2SO4+12O2

(4) S8+H2OH2S+12O2

Subtopic:  Oxidizing & Reducing Agents |
 55%
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Oxidation state of 'P' in Ba(HPO3) is

(1) +1

(2) +2

(3) +3

(4) +4

Subtopic:  Oxidizing & Reducing Agents |
 86%
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