A compound contains atoms of three elements A,B and C. If the oxidation number of A is +2, Bis +5 and that of C is -2, the possible formula of the compound is

(a) A2(BC3)2

(b) A3(BC4)2

(c) A3(B4C)2

(d) ABC2 

Concept Questions :-

Introduction to Redox
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The number of peroxide linkages in CrO5 is /are

(1) one

(2) two

(3) three

(4) none

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Conversion of PbSO4 to Pbs is:

(a) reduction of S

(b) oxidation of S

(c) dissociation

(d) none of these

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Aqueous solution of SO2 reacts with H2S to precipitate sulphur. Here SO2 acts as:

(a) catalyst

(b) reducing agent

(c) oxidising agent

(d) acid

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Which of the following is a redox reaction?

(a) NaCl + KNO3 NaNO3 + KCl

(b) CaC2O4 + 2HCl CaCl2 + H2C2O4

(c) Mg(OH)2 + 2NH4Cl MgCl2 + 2NH4OH

(d) Zn + 2AgCN 2Ag + Zn(CN)2

Concept Questions :-

Introduction to Redox
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In which of the following reaction,reduction of hydrogen takes place ?

(a) Carbon Monoxide + Copper Oxide  Carbon Dioxide + Copper

(b) Copper Oxide + Hydrochlorid Acid  Water + Copper Chloride

(c) Steam + Iron Hydrogen + Iron oxide

(d) Hydrogen+ Iron Oxide  Water + Iron

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Oxidation number of Fe in K3[Fe(CN)6] is:

(a) +2

(b) +3

(c) +4

(d) +1

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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It is found that v forms a double salt isomorphous with Mohr's salt. The oxidation number of V in this compound is:

(a) +3

(b) +2

(c) +4

(d) -4

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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The correct order of reducing power of halide ions is:

(a) Cl- > Br- > I- > F-

(b) Cl- >  I- > Br- > F-

(c)  Br> Cl- > I- > F-

(d)  I- > Br> Cl- > F-

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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When H2SO3 is converted into H2SO4 the change in the oxidation state of sulphur is from:

(a) 0 to +2

(b) +2 to +4

(c) +4 to +2

(d) +4 t0 +6

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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