BPCL - Technical Subject - Redox Reaction

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Question - 1

A sulphur containing species that cannot be a reducing agent is 

  • A SO2
  • B SO32-
  • C H2SO4
  • D S2-

Question - 2

Which of the following halogen acid is better reducing agent?

  • A HCl
  • B HBr
  • C HI
  • D HF

Question - 3

Which substance is serving as a reducing agent in the following reduction?

\(14{ H }^{ + }+{ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }+{ 3Ni }{ \longrightarrow }{ 2Cr }^{ 3+ }+7H_{ 2 }O+3{ Ni }^{ 2+ }\)

  • A H2O
  • B Ni
  • C H+
  • D Cr2O72+

Question - 4

In the reaction 

\({ SO }_{ 2 }+{ 2H }_{ 2 }S\longrightarrow 3S+{ 2 }{ H }_{ 2 }O\)

the substance oxidised is 

  • A H2S
  • B SO2
  • C S
  • D H2O

Question - 5

Which one of the following reactions represents the oxidising property of H2O2?

  • A \({ 2MnO }_{ 4 }+3{ H }_{ 2 }{ SO }_{ 4 }+5{ H }_{ 2 }{ O }_{ 2 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ 2MnSO }_{ 4 }+8{ H }_{ 2 }O+{ 5O }_{ 2 }\)
  • B \({ 2K }_{ 3 }[Fe(CN)_{ 6 }]+2{ KOH+ }{ H }_{ 2 }{ O }_{ 2 }\longrightarrow { 2K }_{ 4 }[Fe(CN)_{ 6 }]+{ 2 }{ H }_{ 2 }O+{ O }_{ 2 }\)
  • C \({ PbO }_{ 2 }+{ H }_{ 2 }O\longrightarrow { PbO }+{ H }_{ 2 }O+{ O }_{ 2 }\)
  • D \({ 2KI+ }H_{ 2 }{ SO }_{ 4 }+{ H }_{ 2 }{ O }_{ 2 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ I }_{ 2 }+2{ H }_{ 2 }O\)

Question - 6

in the reaction 

\({ 2KMnO }_{ 4 }+16HCl\longrightarrow { 5Cl }_{ 2 }+{ 2MnCl }_{ 2 }+2KCl+8{ H }_{ 2 }O\)

the reduction is 

  • A CL2
  • B MnCl2
  • C H2O
  • D KCl

Question - 7

the reaction in which hydrogen peroxide acts as a reducing agent is

  • A \(Pbs+4{ H }_{ 2 }{ O }_{ 2 }\longrightarrow { PbSO }_{ 4 }+4{ H }_{ 2 }0\)
  • B \({ 2Kl }+{ H }_{ 2 }{ O }_{ 2 }\longrightarrow { 2KOH }+I_{ 2 }\)
  • C \({ Ag }_{ 2 }O+{ H }_{ 2 }{ O }_{ 2 }\longrightarrow { 2Ag }+{ H }_{ 2 }O+{ O }_{ 2 }\)
  • D \({ H }_{ 2 }SO_{ 3 }+{ H }_{ 2 }{ O }_{ 2 }\longrightarrow { H }_{ 2 }{ SO }_{ 4 }+{ H }_{ 2 }O\)

Question - 8

IN the reaction \(3B{ r }_{ 2 }+{ 6CO }_{ 3 }^{ 2- }+{ 3H }_{ 2 }O\longrightarrow { 5Br }^{ - }+{ BrO }_{ 3 }^{ - }+{ 6HCO }_{ 3 }^{ - }\)

  • A bromine is oxidised and carbonate is reduced
  • B bromine is reduced and water is oxidised
  • C bromine is neither reduced nor oxidised
  • D bromine is both redyced and oxidised

Question - 9

Which of the following substances acts as an oxidising asa well as reducing agent?

  • A Na2O2
  • B SnCl2
  • C Na2O2
  • D NaNO2

Question - 10

The number of moles of KMnO4 reduced by the one mole of KI in alkaline medium is

  • A one fifth
  • B five
  • C one
  • D two