Conversion of PbSO4 to Pbs is:

(1) reduction of S

(2) oxidation of S

(3) dissociation

(4) none of these

Subtopic:  Oxidizing & Reducing Agents |
 81%
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Oxidation number of Fe in K3[Fe(CN)6] is:

(a) +2

(b) +3

(c) +4

(d) +1

Subtopic:  Oxidizing & Reducing Agents |
 95%
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The correct order of reducing power of halide ions is:

(1) Cl- > Br- > I- > F-

(2) Cl- >  I- > Br- > F-

(3)  Br> Cl- > I- > F-

(4)  I- > Br> Cl- > F-

Subtopic:  Oxidizing & Reducing Agents |
 84%
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In which of the following processes nitrogen is oxidised?

(a) NH4+ N2

(b) NO3- NO

(c) NO2 NO2-

(d) NO3 NH4+ 

Subtopic:  Oxidizing & Reducing Agents |
 79%
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Fluorine is a strong oxidising agent because:

(1) it has several isotopes

(2) it is very small and has 7 electrons in valency shell

(3) its valency is one

(4) it is the first member of the halogen series

Subtopic:  Oxidizing & Reducing Agents |
 80%
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The oxidation state of Ni in Ni(CO)4 is:

(a) zero

(b) +4

(c) +8 

(d) +2

Subtopic:  Oxidizing & Reducing Agents |
 87%
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When SO2 is passed through acidified solution of potassium dichromate, then chromium sulphate is formed. The change in oxidation number of chromium is:

(1) +4 to+2 

(2) +5 to+3

(3) +6 to+3

(4) +7 to+2

Subtopic:  Oxidizing & Reducing Agents |
 81%
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In the reaction;

2Ag + 2H2SOAg2SO4 + 2H2O + SO2,H2SO4 acts as:

(1) oxidising agent

(2) reducing agent

(3) dehydrating agent

(4) none of these

Subtopic:  Balancing of Equations |
 77%
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In the equation,

NO2- +  H2NO3- + 2H+ + ne-

n stands for:

(a) H+

(b) e-

(c) 2e-

(d) 3e-

Subtopic:  Oxidizing & Reducing Agents |
 78%
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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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