In the reaction between acidified K2Cr2O7 and iron (II) ions shown by the equation:

Cr2O72-(aq) + 6Fe2+(aq) +14H+(aq)2Cr3+(aq) + 7H2O(l) + 6Fe3+(aq)

(a) the colour of the solution changes from green to blue

(b) the iron (II) ions are reduced 

(c) the dichromate ions are reduced 

(d) hydrogen ions are reduced

Subtopic:  Oxidizing & Reducing Agents |
 81%
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Which metal exhibits more than one oxidation states?

(1) Na

(2) Mg

(3) Al

(4) Fe

Subtopic:  Introduction to Redox and Oxidation Number |
 89%
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In which iron has the lowest oxidation state?

(a) Fe(CO)5

(b) Fe2O

(c) K4Fe(CN)6

(d) FeSO4.(NH4)2SO4.6H2O

Subtopic:  Oxidizing & Reducing Agents |
 88%
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When an acidified solution of ferrous ammonium sulphate is treated with KMnO4 solution, the ion which is oxidised is:

(a) Fe2+

(b) SO42-

(c) NH4+

(d) MnO4-

 

Subtopic:  Oxidizing & Reducing Agents | Redox Titration & Type of Redox |
 75%
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In the reaction,

2Na2S2O+ I Na2S4O6 + 2NaI,

the oxidation state of sulphur is:

(1) decreased

(2) increased

(3) unchanged

(4) none of these

Subtopic:  Oxidizing & Reducing Agents |
 81%
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During a redox change, the oxidant K2Cr2O7 is always reduced to:

(1) Cr5+

(2) Cr4+

(3) Cr3+

(4) Cr2+

Subtopic:  Introduction to Redox and Oxidation Number |
 88%
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Which is not a redox change?

(a) CaCO3 CaO + CO2

(b) 2H2 + O2 2H2O

(c) Na + H2 NaOH + 1/2 H2

(d) MnCl3  MnCl2 + 1/2 Cl2

Subtopic:  Introduction to Redox and Oxidation Number |
 71%
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In the reaction;

3Br2 + 6CO32- + 3H25Br- + BrO3- + 6HCO3-

which statement is correct?

(a) Br2 is oxidised

(b) Br2 is reduced

(c) Br2 is neither oxidised nor reduced

(d) Br2 is oxidised and reduced as well 

Subtopic:  Introduction to Redox and Oxidation Number |
 72%
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Which of the following colligative properties is associated with the concentration term 'molarity'?

(1) Lowering of vap.pressure

(2) Osmotic pressure

(3) Depression in freezing point

(4) Elevation in boiling point

Subtopic:  Osmosis & Osmotic Pressure |
 82%
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Amongst the following identify the species with an atom in (+6) oxidation state.

1. MnO4-

2. Cr(CN)3-6

3. NiF62-

4. CrO2Cl2

Subtopic:  Oxidizing & Reducing Agents |
 88%
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