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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A metallic oxide contains 20% oxygen. The equivalent weight of metal is

1. 12

2. 16

3. 32

4. 64

Subtopic:  Equivalent Weight |
 63%
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Which one is correct about CH2 = CCl2?

(1) Both carbon are in +2 oxidation state.

(2)  Both carbon are in +- oxidation state.

(3) Once carbon has +2 and other -2 oxidation state.

(4) The average oxidation number of carbon is +1.

Subtopic:  Balancing of Equations |
 83%
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What is the equivalent weight of H3PO3 in the following disproportionation reaction:-

H3POH3PO4 + PH3

1. M6   

 2. M2 

3.  2M3 

 4. M3

Subtopic:  Equivalent Weight |
 51%
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25.0 g of FeSO4.7H2O was dissolved in water containing dilute H2SO4, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO4 solution for complete oxidation. The percentage of FeSO4. 7H2O in the acid solution is

(1) 78%

(2) 98%

(3) 89%

(4) 79%

Subtopic:  Redox Titration & Type of Redox |
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