Which of the following is Redox reaction?

1. 2CrO42- + 2H+ Cr2O72- + H2O

2. CuSO4 + 4NH3 [Cu (NH3)4] SO4

3. 2Na2S2O3 + I2 Na2S4O6 + 2NaI

4. Cr2O72- + 2OH- 2CrO42- + H2O

Subtopic:  Introduction to Redox and Oxidation Number |
 71%
From NCERT
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In the following reaction, balancing coefficients X and Y are:

X HI + Y HNO3 NO + I2 + H2O

1. X=3, Y=2

2. X=2, Y=3

3. X=6, Y=2

4. X=6, Y=1

Subtopic:  Balancing of Equations |
 57%
From NCERT
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An element x reacts with oxygen to form a compound X2O3. If the atomic mass of x is 91.5 the equivalent mass of x is:-

1. 30.5

2. 45.75

3. 61

4. 91.5

Subtopic:  Equivalent Weight |
 64%
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The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. The atomic weight of the metal is:-

1. 18

2. 9

3. 4.5

4. 36

Subtopic:  Equivalent Weight |
 66%
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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:  Oxidizing & Reducing Agents | Application of Electrode Potential |
 63%
From NCERT
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Which of the following is not an intramolecular redox reaction?

1. NH4NO2 N2 + 2H2O

2. 2Mn2O7 4MnO2 + 3O2

3. 2KClO3 2KCl + 3O2

4. 2H2O2 2H2O + O2

Subtopic:  Balancing of Equations |
From NCERT
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 The compound having oxygen in - 1 oxidation state is:-

1. H2O 2. O2F2
3. Na2O 4. BaO2
Subtopic:  Oxidizing & Reducing Agents |
 60%
From NCERT
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What will be the value of x and y by balancing the reaction

C2H5OH + X I2 + Y OH- CHI3 + HCO2- + 5I- + 5H2O

1. 4,6

2. 2,6

3. 2,4

4.  4,4

Subtopic:  Application of Electrode Potential |
 69%
From NCERT
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Which is the correct set that can only act as an oxidant? 

1. NO3-, SO3, Na 2. Fe+3, NO3-, SO3
3. I-, Na 4. I-, NO3-
Subtopic:  Oxidizing & Reducing Agents |
 67%
From NCERT
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Which one is correct about CH2 = CCl2?

1. Both carbons are in +2 oxidation state.

2.  Both carbons are in +1 oxidation state.

3. One carbon has +2 and other -2 oxidation states.

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

Subtopic:  Balancing of Equations |
 82%
From NCERT
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