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Redox Reactions Class 11 MCQs Questions with Answers
The value of x & y in the following redox reaction-
xCl2 + 6OH– → ClO−3 + yCl– + 3H2O are
(a) x = 2, y = 4
(b) x = 5, y = 3
(c) x = 3, y = 5
(d) x = 4, y = 2
Answer: (c) x = 3, y = 5
The oxidation number of Xe in BaXeO6 is
(a) 8
(b) 6
(c) 4
(d) 10
Answer: (d) 10
What is known as Autooxidation?
(a) Formation of H2O by the oxidation of H2O2
(b) Formation of H2O2 by the oxidation of H2O
(c) Both (1) and (2) are true
(d) None of the above
Answer: (b) Formation of H2O2 by the oxidation of H2O
(x) MnO−4 + (y) H2O2 → 2 Mn2+ + 5H2O + 9O2 + 2e–
In this reaction the value of (x)
(a) 2, 5, 6
(b) 5, 2, 9
(c) 3, 5, 5
(d) 2, 6, 6
Answer: (a) 2, 5, 6
If equal volumes of 1M KMnO4 and 1M K2Cr2O7 solutions are allowed to oxidize Fe2+ in acidic medium. The amount of iron oxidized will be
(a) More with KMnO2
(b) More with K2Cr2O7
(c) Equal with both oxidising agents
(d) Cannot be determined
Answer: (b) More with K2Cr2O7
Oxidation state of osmium (Os) in OsO4 is
(a) +7
(b) + 6
(c) +4
(d) + 8
Answer: (d) + 8
When KMnO4 acts as an oxidising agent and ultimately forms MnO2−4, MnO2, Mn2O3 and Mn2+ then the no. of electrons transferred in each case respectively is
(a) 4, 3, 1, 5
(b) 1, 5, 3, 7
(c) 1, 3, 4, 5
(d) 3, 5, 7, 1
Answer: (c) 1, 3, 4, 5
How many millilitres of 0.5 M H2SO4 are needed to dissolve 0.5 g of copper(II)carbonate?
(a) 6.01
(b) 4.5
(c) 8.1
(d) 11.1
Answer: (c) 8.1
Consider the following reaction: Zn + Cu2+ → Zn2+ + Cu
With reference to the above, which one of the following is the correct statement?
(a) Zn is reduced to Zn2+ ions
(b) Zn is oxidised to Zn2+ ions
(c) Zn2+ ions are oxidised to Zn
(d) Cu2+ ions are oxidized to Cu
Answer: (b) Zn is oxidised to Zn2+ ions
For the reaction: Mx+ + MnO−4 → MO−3 + Mn2+ + 23O2, if one mole of MnO−4 oxidised 1.67 moles of Mx+ to MO−3, then the value of x in the reaction will be
(a) 5
(b) 3
(c) 2
(d) 1
Answer: (c) 2
Pure water is bad conductor of electricity because
(a) It has high boiling point
(b) It is almost unionised
(c) Its molecules are associated with H- bonds
(d) Its pH is 7 at 25°C
Answer: (b) It is almost unionised
One mole of N2H4 loses ten moles of electrons to form a new compound A. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in A? (There is no change in the oxidation state of hydrogen.)
(a) -1
(b) -3
(c) +3
(d) +5
Answer: (c) +3
Oxidation number of H in NaH, CaH2 and LiH, respectively is
(a) –1,–1, –1
(b) –1, +1, + 1
(c) +1, +1, –1
(d) +1, + 1, + 1
Answer: (a) –1,–1, –1
What is n-factor?
(a) Equal to product of Number of moles of electrons when Lost or gained by one mole of reductant or oxidant
(b) When Number of moles of electrons Lost or gained by one mole of reductant or oxidant is not same.
(c) Equal to Number of moles of electrons Lost or gained by one mole of reductant or oxidant
(d) None of the above
Answer: (c) Equal to Number of moles of electrons Lost or gained by one mole of reductant or oxidant
Which is a redox reaction?
(a) H2SO4 + 2NaOH → Na2SO4 + 2H2O
(b) BaCl2 + H2SO4 → BaSO4 + 2HCl
(c) CH3COOH + C2H5OH → CH3COOC2H5 + H2O
(d) 2FeCl3 + SnCl2 → 2FeCl2 + SnCl4
Answer: (d) 2FeCl3 + SnCl2 → 2FeCl2 + SnCl4
The ionic mobility of alkali metal ions in aqueous solution is maximum for
(a) Li+
(b) Na+
(c) K+
(d) Rb+
Answer: (d) Rb+
In oxygen difluoride, the oxidation number of oxygen is
(a) + 2
(b) – 2
(c) – 1
(d) +1, – 2
Answer: (a) + 2
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?
(a) Copper
(b) Magnesium
(c) Iron
(d) Silver
Answer: (b) Magnesium
The oxidation number of iron in Fe3O4 is
(a) +2
(b) +3
(c) 8/3
(d) 2/3
Answer: (c) 8/3
A standard reduction electrode potentials of four metals are A = -0.250 V, B = -0.140 V, C = -0.126 V, D = -0.402 V The metal that displaces A from its aqueous solution is
(a) A
(b) B
(c) C
(d) D
Answer: (d) D
The oxide, which cannot act as a reducing agent, is
(a) CO2
(b) NO2
(c) SO2
(d) ClO2
Answer: (a) CO2
The most powerful oxidising agent among the following is
(a) H2SO4
(b) H3BO3
(c) HPO3
(d) H3PO4
Answer: (a) H2SO4
The colourless solution of silver nitrate slowly turns blue on adding copper chips to it because of
(a) Dissolution of Copper
(b) Oxidation of Ag+ → Ag
(c) Reduction of Cu2+ ions
(d) Oxidation of Cu atoms.
Answer: (d) Oxidation of Cu atoms
A metal ion M³+ loses 3 electrons, its oxidation number will be
(a) +6
(b) –3
(c) +3
(d) 0
Answer: (a) +6
Reduction never involves:
(a) gain of electrons
(b) decrease in oxidation number
(c) loss of electrons
(d) decrease in valency of electropositive component
Answer: (c) loss of electrons
Burning of lime to give calcium oxide and carbon dioxide is
(a) An Oxidation Process
(b) A Reduction Process
(c) Disproportionation
(d) Decomposition
Answer: (d) Decomposition
Which of the following processes does not involve either oxidation or reduction?
(a) Formation of slaked lime from quick lime
(b) Heating Mercuric Oxide
(c) Formation of Manganese Chloride from Manganese oxide
(d) Formation of Zinc from Zinc blende
Answer: (a) Formation of slaked lime from quick lime
How many mililitres of 0.5 M H2SO4 are needed to dissolve 0.5 g of copper(II)carbonate?
(a) 6.01
(b) 4.5
(c) 8.1
(d) 11.1
Answer: (c) 8.1
The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is
(a) One
(b) Two
(c) Five
(d) One fifth
Answer: (b) Two
A compound contains atoms of three elements -A, B & C. If the oxidation number of A is +2, B is +5 and that of C is -2 the possible formula of the compound is-
(a) A3(BC4)2
(b) A3(B4C)2
(c) ABC2
(d) A3(BC3)2
Answer: (a) A3(BC4)2
Among the following, identify the species with an atom in + 6 oxidation state:
(a) MnO−4
(b) Cr(CN)3−6
(c) NiF2−6
(d) CrO2Cl2
Answer: (d) CrO2Cl2
KMnO4 reacts with oxalic acid according to the equation 2MnO4– + 5C2O42- + 16H+ → 2Mn2+ +10CO2 + 8H2O Here 20 mL of 0.1 M KMnO4 is equivalent to
(a) 50 mL of 0.5 M C2H2O4
(b) 20 mL of 0.1 M C2H2O4
(c) 20 mL of 0.5 M C2H2O4
(d) 50 mL of 0.1 M C2H2O4
Answer: (d) 50 mL of 0.1 M C2H2O4
Number of moles of K2Cr2O7 reduced by 1 mole of Sn2+ is
(a) 1/6
(b) 1/3
(c) 2/3
(d) 1
Answer: (b) 1/3
Which of the following is not a redox reaction?
(a) Burning of candle
(b) Rusting of iron
(c) Dissolving salt in water
(d) Dissolving Zinc in dil. H2SO4
Answer: (c) Dissolving salt in water
Oxidation number of P in PO43-, of S in SO42- and that of Cr in Cr2O72- are respectively:
(a) +3, +6 and +5
(b) +5, +3 and +6
(c) +3, +6 and +6
(d) +5, +6 and +6
Answer: (d) +5, +6 and +6
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