Class 11 Chemistry Chapter 8 Redox Reactions MCQs
Questions
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 the largest oxidation number?
Answer:3d5 4s2
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3
Which of the following arrangements represent increasing oxidation number of the central atom?
Answer:CrO2- , CIO-3, CrO2-4 , MnO-4
4
In which of the following compounds, an element exhibits two different oxidation states.
Answer:NH4NO3
5
The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?
Answer:The oxidation number of hydrogen is always +1.
6
Thiosulphate reacts differently with iodine and bromine in the reactions given below:
2S2O32- + I2 → S4O62- + 2I–
S2O32-+ 2Br2+ 5H2O → 2SO42- + 2Br–+ 10 H+
Which of the following statements justifies the above dual behaviour of thiosulphate?
Answer:Bromine is a stronger oxidant than iodine.
7
Using the standard electrode potential, find out the pair between which redox reaction is not feasible.
E°Values: Fe3+/ Fe2+ = +0.77; I2/I- = +0.54;
Cu2+/ Cu = -0.34; Ag+ /Ag = + 0.80 V
Answer:Ag and Fe3+
8
Eᶱvalues of some redox couples is given below. Based on these values
choose the correct option.
Eᶱ values : Br2/Br–= + 1.90; Ag+/Ag(s) = + 0.80
Cu2+/Cu(s) = + 0.34; I2(s)/I– = + 0.54
Answer:Cu will reduce Br2
9
The more positive the value of Eᶱ, the greater is the tendency of the species to get reduced. Using the standard electrode potential of redox couples given below to find out which of the following is the strongest oxidising agent. Eᶱ Values : Fe3+/Fe2+ = + 0.77; I2(s)/I– = + 0.54;
Cu2+/Cu = + 0.34; Ag+/Ag = + 0.80V
Answer:Ag
10
Which of the following is not an example of redox reaction?
Answer:BaCl2 + H2SO4→ BaSO4 + 2HCl
11
he oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?
Answer:The oxidation number of hydrogen is always +1.
12
In which of the following compounds, an element exhibits two different oxidation states.
Answer:NH4NO3
13
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?
Answer:3d54s2
15
The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?
Answer:The oxidation number of hydrogen is always +1.
16
In which of the following compounds, an element exhibits two different oxidation states.
Answer:N2H4
17
The more positive the value of E⊖ , the greater is the tendency of the species to get reduced. Using the standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent.
Answer:Ag+
18
E⊖ values of some redox couples are given below. On the basis of these values choose the correct option.
Answer:Cu will reduce Br2
19
Using the standard electrode potential, find out the pair between which redox reaction is not feasible.
Answer:Ag and Fe3+
20
Identify disproportionation reaction
Answer:2NO2 + 2OH– ⎯→ NO2– + NO3– + H2O
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