In Na2S2O3, the oxidation number of S is

1. +2

2. +4 & zero

3. +6 & -2

4. +3

Subtopic:  Oxidizing & Reducing Agents |
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Which acts as a reducing agent only?

1. SO2

2. HNO3

3. MnO2

4. H2S

Subtopic:  Oxidizing & Reducing Agents |
 65%
From NCERT
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MnO4-(aq) + 8H+(aq) + 5e- Mn2+(aq) + 4H2O(l);E°=1051V

Cr2O72-(aq) +14H+(aq) + 6e 2Cr3+(aq) + 7H2O(l);E°=1.38V

Fe3+(aq) + e- Fe2+(aq);E°=0.77V

Cl2(g) + 2e- 2Cl-(aq); E°= 1.40V

The incorrect statement regarding the quantitative estimation of aqueous  Fe(NO3)is -

 

1. MnO4- can be used in aqueous HCl

2. Cr2O72- can be used in aqueous HCl

3. MnO-24 can be used in aqueous H2SO4

4.  Cr2O72- can be used in aqueous H2SO4

Subtopic:  Emf & Electrode Potential |
From NCERT
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The equivalent weight of H3PO2, when it disproportionates into PH3 and H3PO3 is 

1. 66

2. 49.5

3. 33

4. 20.5

Subtopic:  Equivalent Weight |
 66%
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In the reaction, 2Cu+ Cu + Cu2+, the equivalent weight of Cu+ is (M is the mol. wt. of Cu+)

1. M

2. M/2

3. M/4

4. 2M

Subtopic:  Equivalent Weight |
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Equal volumes of 1M each of KMnO4 and K2Cr2O7 are used to oxidize Fe(II) solution in acidic medium. The amount of Fe oxidized will be

1. More with  KMnO4 

2. More with K2Cr2O7 

3. Equal with both oxidising agent

4. Cannot be determined

Subtopic:  Equivalent Weight |
 55%
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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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