The pair of compounds that can exist together is

1. FeCl3, SnCl2             

2. HgCl2, SnCl2

3. FeCl2, SnCl2             

4. FeCl3, KI

Subtopic:  Introduction to Redox | Oxidizing & Reducing Agents (Oxidation No) |
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A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the

reaction which element undergoes a maximum change in the oxidation number?

1. S

2. H

3. Cl

4. C

Subtopic:  Oxidizing & Reducing Agents (Oxidation No) |
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Oxidation states of P in H4P2O5, H4P2O6, H4P2O7, arc respectively

1. +3, +5, +4

2. +5, +3, +4

3. +5, +4, +3

4. +3, +4, +5

 

 

Subtopic:  Oxidizing & Reducing Agents (Oxidation No) |
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Number of moles of MnO-4 required to oxidise one mole of ferrous oxalate completely in acidic medium will be

1. 0.6 mole

2. 0.4 mole

3. 7.5 moles

4. 0.2 mole

Subtopic:  Oxidizing & Reducing Agents (Oxidation No) | Redox Titration |
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Which of the following oxidation states are the most characteristics for lead and tin respectively?

(1) +4, +2                     

(2) +2, +4

(3) +4, +4                     

(4) +2, +2

Subtopic:  Oxidizing & Reducing Agents (Oxidation No) |
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Which one of the following orders correctly represents the increasing acid strengths of the given acids?

(1) HOCl <HOClO <HOClO< HOClO3

(2) HOClO <HOCl <HOClO<HOClO2

(3) HOClO<HOClO<HOClO <HOCl

(4) HOClO3> HOClO<HOClO <HOCl

Subtopic:  Oxidizing & Reducing Agents (Oxidation No) |
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The correct order of N-compounds in its decreasing order of oxidation states is
1. HNO3, NO, N2, NH4Cl
2. HNO3,NO,NH4Cl,N2
3. HNO3,NH4Cl,NO,N2
4. NH4Cl,N2,NO,HNO3
Subtopic:  Oxidizing & Reducing Agents (Oxidation No) |
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For the redox reaction 
 MnO4-+C2O42-+H-Mn2++CO2+H2O
the correct coefficients of the reactants for the balanced equation are MnO4-, C2O42- and H+

1. 16, 5, 2
2. 2, 5, 16
3. 2, 16, 5
4. 5, 16, 2

Subtopic:  Balancing of Equations |
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When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

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 (Oxidation No) |
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In which of the following compounds, nitrogen exhibits highest oxidation state?

1. N2H4

2. NH3

3. N3H

4. NH2OH

Subtopic:  Oxidizing & Reducing Agents (Oxidation No) |
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