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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In which of the following processes nitrogen is oxidised?

(a) NH4+ N2

(b) NO3- NO

(c) NO2 NO2-

(d) NO3 NH4+ 

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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In which reaction is hydrogen acting as an oxidising agent?

(a) With ioding to give hydrogen iodide

(b) With lithium to give lithium hydride

(c) With nitrogen to give ammonia

(d) With sulphur to give hydrogen sulphide

 

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Fluorine is a strong oxidising agent because:

(a) it has several isotopes

(b) it is very small and has 7 electrons in valency shell

(c) its valency is one

(d) it is the first member of the halogen series

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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The oxidation state of Ni in Ni(CO)4 is:

(a) zero

(b) +4

(c) +8 

(d) +2

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Milliequivalents of a solute in a solution can be given by:

(a) Mzeq. = M x Vin mL

(b) Meq. = N x Vin mL

(c) Mzeq. = massEq. mass×1000

(d) both (b) and (c) 

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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HBr and HI reduce H2SO4, HCl can reduce KMnO4 and HF can reduce:

(a) H2SO4

(b) K2Cr2O7

(c) KMnO4 

(d) none of these

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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Sulphurous acid can be used as:

(a) oxidising agent

(b) reducing agent

(c) bleaching agent

(d) all of these

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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When SO2 is passed through acidified solution of potassium dichromate, then chromium sulphate is formed. The change in oxidation number of chromium is:

(a) +4 to+2 

(b) +5 to+3

(c) +6 to+3

(d) +7 to+2

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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In which transfer of five electrons takes place?

(a) MnO4-  Mn2+

(b) CrO42- Cr3+

(c) MnO4-  MnO2

(d) Cr2O72- 2Cr3+

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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