Which is not a redox reaction?

(a) BaO2 + H2SO4 BaSO4 +  H2O

(b) 2BaO + O2  2BaO

(c) 4KClO3 4KClO2 + 2O2 

(d) SO2 + 2H22H2O + 3S

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In the preparation of chlorine from HCl; MnO2 acts as:

(a) reducing agent

(b) oxidising agent

(c) catalytic agent

(d) dehydrating agent

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Which combination is odd with respect to oxidation numbers of S, Cr, N and H respectively:\

(a) H2SO5, H2S2O8, H2SO4, SF6

(b) K2Cr2O7, K2CrO4, CrO5, CrO2Cl2

(c) NH3 , NH4, N3H, NO2-   

(d) CaH2 , NaH , LiH, MgH2

Concept Questions :-

Introduction to Redox
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In which reaction H2O2 acts as a reducing agent?

(a) Ag2O + H2O2 2Ag + H2O + O2

(b) 2KI + H2O2KOH + I2

(c) PbS + 4H2OPbSO4 + 4H2O2

(d) H2O+ SO2  H2SO4

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statement is incorrect in this reaction?

(a) Evolved I2 is reduced

(b) CuI2 is formed

(c) Na2S2O3 is oxidised

(d) Cu2I2 is formed

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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In the equation,

NO2- +  H2NO3- + 2H+ + ne-

n stands for:

(a) H+

(b) e-

(c) 2e-

(d) 3e-

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl:

(a) oxidises oxalic acid to carbon dioxide and water

(b) gets oxidised by oxalic acid to chlorine

(c) furnishes H+ ions in addition to those from oxalic acid

(d) reduces permanganate to Mn2+

Concept Questions :-

Redox Titration
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KMnO4 in acid medium is always reduced to:

(a) Mn4+ 

(b) Mn2+ 

(c) Mn6+

(d) Mn

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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In the reaction between acidified K2Cr2O7 and iron (II) ions shown by the equation:

Cr2O72-(aq) + 6Fe2+(aq) +14H+(aq)2Cr3+(aq) + 7H2O(l) + 6Fe3+(aq)

(a) the colour of the solution changes from green to blue

(b) the iron (II) ions are reduced 

(c) the dichromate ions are reduced 

(d) hydrogen ions are reduced

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Oxidation number of carbon in C3O2, Mg2C3 are respectively:

(a) -4/3, +4/3 

(b) +4/3, -4/3

(c) -2/3, +2/3

(d) -2/3, +4/3

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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