Which of the following reactions are disproportionation reactions?

(a) Cu+Cu2++Cu

(b) 3MnO42-+4H+2MnO4-+MnO2+2H2O

(c) 2KMnO4K2MnO4+MnO2+O2

(d) 2MnO4-+3Mn2++2H2O5MnO2+4H+

1. a, b

2. a, b, c

3. b, c, d

4. a, d

Subtopic:  Redox Titration & Type of Redox |
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1.520g of the hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent mass of metal is:

1. 1.520

2. 0.995

3. 19.00

4. 9.00

Subtopic:  Equivalent Weight |
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0.5 g of fuming H2SO4 (oleum) is diluted  with water. This solution is completely neutralised by 26.7 mL of 0.4 N NaOH. The percentage of free SO3 in the sample is:

1. 30.6% 

2. 40.6%

3. 20.6%

4. 50%

Subtopic:  Equivalent Weight |
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In which of the following processes nitrogen is oxidised?

1. NH4+ N2

2. NO3- NO

3. NO2 NO2-

4. NO3-NH4+ 

Subtopic:  Oxidizing & Reducing Agents |
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In the preparation of chlorine from HCl; MnO2 acts as:

1. Reducing agent

2. Oxidising agent

3. Catalytic agent

4. Dehydrating agent

Subtopic:  Oxidizing & Reducing Agents | Redox Titration & Type of Redox |
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Oxidation number of carbon in C3O2, Mg2C3 are respectively:

1. -4/3, +4/3 

2. +4/3, -4/3

3. -2/3, +2/3

4. -2/3, +4/3

Subtopic:  Oxidizing & Reducing Agents |
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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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