The oxidation number and covalency of sulphur in the sulphur molecule (S8) are respectively:

1. 0, and 2

2. +6, and 8

3. 0, and 8

4. +6, and 2

Subtopic:  Introduction to Redox and Oxidation Number |
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Hypochlorite disproportionate to give

1. Cl- and ClO4-

2. ClO4- and ClO3-

3. ClO3- and Cl-

4. ClO2- and Cl-

Subtopic:  Redox Titration & Type of Redox |
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When Cl2 is converted into Cl- & ClO3- then n-factor of Clwill be:

1. 3/5

2. 5/3

3. 7/2

4. 2

Subtopic:  Equivalent Weight |
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MnO2 + 4HCl MnCl2+2H2O+Cl2, the equivalent wt. of HCl will be (MMol wt of HCl)

1. M

2. M/2

3. 2M

4. M/4

Subtopic:  Equivalent Weight |

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In the following unbalanced reaction

A2+ + B3+ A4+ + B

The total number of e- transferred during reaction is:

1. 2

2. 3

3. 6

4. 8

Subtopic:  Balancing of Equations | Redox Titration & Type of Redox |
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In the reaction

xBrO3- + yCr+3 + zH2Br2 + CrO4-2 + H+

the coefficients x,y,z are respectively ?

1. 6, 10, 11

2. 6, 10, 20

3. 6, 8, 22

4. 6, 10, 22

Subtopic:  Balancing of Equations |
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In the reaction

Al + Fe3O4 Al2O3 + Fe

total number of electrons transferred during reaction are:-

1. 6

2. 8

3. 8/3

4. 24

Subtopic:  Balancing of Equations |
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x gram of pure As2S3 is completely oxidised to respective highest oxidation states by 50 ml of 0.1 M hot acidified KMnO4 then x mass of As2S3 taken is : (Molar mass of As2S3 = 246)

1. 22.4 g

2. 43.92 g

3. 64.23 g

4. None

Subtopic:  Redox Titration & Type of Redox |
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In the reaction Na2S2O3 + 4Cl2 + 5H2O → Na2SO4 + H2SO4 + 8HCI the equivalent weight of Na2S2O3 will be

1. M/4

2. M/8

3. M/1

4. M/2

(M= molecular weight of Na2S2O3)

Subtopic:  Equivalent Weight |
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In the reaction CrO5 + H2SO4 → Cr2(SO4)3 + H2O + O2 one mole of CrO5 will liberate how many moles of O2

1. 5/2

2. 5/4

3. 9/2

4. none of these

Subtopic:  Balancing of Equations |
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