Redox Reactions CBSE Questions & Answers

Redox Reactions

This is Chemistry Class 11 Redox Reactions CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Which of the following arrangements represent increasing oxidation number of the central atom?
  • A
    Cr\({\text{o}}_2^ - \), Cr\({\text{o}}_4^{2 - }\), Mn\({\text{o}}_4^ - \), Cl \({\text{o}}_3^ - \)
  • B
    Cr\({\text{o}}_4^{2 - }\), Mn\({\text{o}}_4^ - \) , Cr\({\text{o}}_2^ - \), Cl \({\text{o}}_3^ - \)
  • C
    Cl \({\text{o}}_3^ - \) , \(Cro_4^{(2 - )}\), Mn\({\text{o}}_4^ - \) , Cr\({\text{o}}_2^ - \)
  • D
    \({\text{Cro}}_2^ - ,{\text{Clo}}_3^ - ,cr{\text{o}}_4^{2 - },mn{\text{o}}_4^ - \)
    Correct
2
The largest oxidation number exhibited by an element depends on its outer electronic configuration. With which of the following outer electronic configurations the element will exhibit largest oxidation number?
  • A
    \({\text{3}}{{\text{d}}^{\text{5}}}{\text{4 }}{{\text{s}}^{\text{1}}}\)
  • B
    \({\text{3}}{{\text{d}}^{\text{1}}}{{\text{s}}^{\text{2}}}\)
  • C
    \({\text{3}}{{\text{d}}^{\text{5}}}{\text{4}}{{\text{s}}^{\text{2}}}\)
    Correct
  • D
    \({\text{3}}{{\text{d}}^{\text{3}}}{\text{4 }}{{\text{s}}^{\text{2}}}\)
3
Consider the elements: Cs, Ne, I and F. Identify the element which exhibits neither the negative nor does the positive oxidation state.
  • A
    Ne
    Correct
  • B
    F
  • C
    Ne and F
  • D
    Cs
4
Which of the following elements does not show disproportionation tendency?
  • A
    Br
  • B
    I
  • C
    Cl
  • D
    F
    Correct
5
Consider the elements: Cs, Ne, I and F. Identify the element(s) that exhibits only Positive oxidation state
  • A
    I
  • B
    Cs and I
  • C
    Cs
    Correct
  • D
    Ne
6
The exhibition of various oxidation states by an element is also related to the outer orbital electronic configuration of its atom. Atom(s) having which of the following outermost electronic configurations will exhibit more than one oxidation state in its compounds.
  • A
    \({\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{3}}}\)
  • B
    \({\text{3}}{{\text{d}}^{\text{1}}}{\text{4}}{{\text{s}}^{\text{2}}}\)
  • C
    \({\text{3}}{{\text{d}}^{\text{2}}}{\text{4}}{{\text{s}}^{\text{2}}}\)
    Correct
  • D
    \({\text{3}}{{\text{s}}^{\text{1}}}\)
7
Which of the following electrodes will act as anodes, when connected to Standard Hydrogen Electrode?
  • A
    \({\text{Fe}}/{\text{F}}{{\text{e}}^{{\text{3}} + }}\) \({{\text{E}}^0} = {\text{ }}--{\text{ }}0.{\text{44}}\)
  • B
    \(F2(g)/2{F^ - }(aq)\) \({{\text{E}}^0} = {\text{ }} + {\text{ 2}}.{\text{87}}\)
  • C
    \({\text{Al}}/{\text{A}}{{\text{l}}^{{\text{3}} + }}\) \({{\text{E}}^0} = {\text{ }}--{\text{1}}.{\text{66}}\)
    Correct
  • D
    \({\text{Cu}}/{\text{C}}{{\text{u}}^{{\text{2}} + }}\) \({{\text{E}}^0} = {\text{ }} + {\text{ }}0.{\text{34}}\)
8
The decomposition of hydrogen peroxide to form water and oxygen is an example of
  • A
    displacement reactions
  • B
    disproportionation reaction
    Correct
  • C
    decomposition reactions
  • D
    combination reactions
9
Identify the correct statements with reference to the given reaction \({{\text{P}}_{\text{4}}} + {\text{ 3O}}{{\text{H}}^ - } + {\text{ 3 }}{{\text{H}}_{\text{2}}}{\text{O }} \to {\text{ P}}{{\text{H}}_{\text{3}}} + {\text{ 3}}{{\text{H}}_{\text{2}}}{\text{Po}}_2^ - \)
  • A
    Phosphorus is undergoing oxidation as well as reduction.
    Correct
  • B
    Hydrogen is undergoing oxidation as well as reduction
  • C
    Phosphorus is undergoing reduction only.
  • D
    Phosphorus is undergoing oxidation only.
10
The electron releasing tendency of the metals, zinc, copper and silver is in the order:
  • A
    Ag>Cu>Zn
  • B
    Zn>Cu>Ag
    Correct
  • C
    Zn>Ag>Cu
  • D
    Cu>Ag>Zn
11
A complex compound in which the oxidation number of a metal is zero is
  • A
    \(\left[ {{\text{Pl }}{{\left( {{\text{NH3 }}} \right)}_{\text{4}}}} \right]{\text{C}}{{\text{l}}_{\text{2}}}\)
  • B
    \(\left[ {{\text{Ni }}{{\left( {{\text{CO}}} \right)}_{\text{4}}}} \right]\)
    Correct
  • C
    \({{\text{K}}_{\text{3}}}\left[ {{\text{Fe }}{{\left( {{\text{CN}}} \right)}_{\text{6}}}} \right]\)
  • D
    \({{\text{K}}_{\text{4}}}\left[ {{\text{Fe }}{{\left( {{\text{CN}}} \right)}_{\text{6}}}} \right]\)
12
Identify the correct statement (s) in relation to the following reaction: \({\text{Zn }} + {\text{ 2HCl }} \to {\text{ ZnC}}{{\text{l}}_{\text{2}}} + {\text{ }}{{\text{H}}_{\text{2}}}\)
  • A
    Chlorine is acting as a reductant
  • B
    Zinc is acting as an oxidant
  • C
    Hydrogen ion is acting as a reductant
  • D
    Hydrogen ion is acting as an oxidant
    Correct
13
The standard emf of a galvanic cell involving 2 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the redox reaction of the cell is
  • A
    \({\text{1}}{0^{{\text{1}}0}}\)
  • B
    \({\text{1}}{0^{\text{5}}}\)
  • C
    \({\text{1}}{0^{{\text{2}}0}}\)
    Correct
  • D
    10
14
Dalda is prepared from oils by
  • A
    hydrolysis
  • B
    oxidation
  • C
    distillation
  • D
    reduction
    Correct
15
Formation of coloured solution is possible when metal ion in the compound contains
  • A
    negative ionic state
  • B
    unpaired electrons
    Correct
  • C
    paired electrons
  • D
    lone pair of electrons