For the redox reaction MnO4+C2O42+H+Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are [IIT 1988, 92; BHU 1995; CPMT 1997; RPMT 1999; DCE 2000; MP PET 2003]

 

MnO4  

C2O42  

H+

(1)  

 2

5

16

(2)

16

5

2

(3)

5

16

2

(4)

2

16

5

Concept Questions :-

Balancing of Equation by Oxidation Number
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Which of the following is the strongest oxidising agent [Pb. CET 2000]

(1) BrO3/Br2+,Eo=+1.50

(2) Fe3+/Fe2+,Eo=+0.76

(3) MnO4/Mn2+,Eo=+1.52

(4) Cr2O72/Cr3+,Eo=+1.33

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In the balanced chemical reaction,

IO3+aI+bH+cH2O+dI2

a, b, c and d respectively correspond to [AIIMS 2005]

(1) 5, 6, 3, 3

(2) 5, 3, 6, 3

(3) 3, 5, 3, 6

(4) 5, 6, 5, 5

Concept Questions :-

Balancing of Equation by Ion Exchange Method
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The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is: [CBSE PMT 2005]

(1) One fifth

(2) five

(3) One

(4) Two

Concept Questions :-

Balancing of Equation by Oxidation Number
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In the equation

H2S+2HNO32H2O+2NO2+S

The equivalent weight of hydrogen sulphide is [BVP 2003]

(1) 16

(2) 68

(3) 34

(4) 17

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If 1.2 g of metal displace 1.12 litre hydrogen at normal temperature and pressure, equivalent weight of metal would be [DPMT 2001]

(1) 24

(2) 12

(3) 1.2 ÷ 11.2

(4) 1.2 × 11.2

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The equivalent weight of phosphoric acid (H3PO4) in the reaction NaOH+H3PO4NaH2PO4+H2O is [AIIMS 1999]

(1) 25

(2) 49

(3) 59

(4) 98

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What is the equivalent mass of IO4 when it is converted into I2 in acid medium [Kerala PMT 2004]

(1) M/6

(2) M/7

(3) M/5

(4) M/4

Concept Questions :-

Equivalent Weight & Normality
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In alkaline medium ClO2 oxidize H2O2 in O2 and reduced itself in Cl then how many mole of H2O2 will oxidize by one mole of ClO2 

1. 1.0

2. 1.5

3. 2.5

4. 3.5

Concept Questions :-

Balancing of Equation by Ion Exchange Method
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Oxidation number of oxygen in potassium super oxide (KO2) is [UPSEAT 1999, 2002]

(1) – 2

(2) – 1

(3) – 1/2

(4) – 1/4

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