Class 11 Chemistry MCQ Chapter 8 Redox Reactions Solutions to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Chemistry MCQ Chapter 8 Redox Reactions Solutions and select need one. Class 11 Chemistry MCQ Chapter 8 Redox Reactions Question Answers Download PDF. AHSEC Chemistry Multiple Choice Class 11 Solutions.
Class 11 Chemistry MCQ Chapter 8 Redox Reactions
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Redox Reactions
Chapter: 8
| MCQ |
1. In the reaction 2Mg(s)+O2(g)→2MgO(s) , the substance being oxidised is:
(i) O2.
(ii) MgO.
(iii) Mg.
(iv) None of the above.
Ans: (iii) Mg.
2. The operation of dry and wet batteries is primarily based on:
(i) Thermal reactions.
(ii) Acid-base reactions.
(iii) Redox processes.
(iv) Precipitation processes.
Ans: (iii) Redox processes.
3. Removal of oxygen from a compound is an example of ________
(i) Oxidation.
(ii) Reduction.
(iii) Oxygenation.
(iv) Dehydrogenation.
Ans: (ii) Reduction.
4. In the reaction 2Na(s)+Cl2(g)→2NaCl(s), which element is oxidised?
(i) Chlorine.
(ii) Sodium.
(iii) Oxygen.
(iv) Sulphur.
Ans: (ii) Sodium.
5. The development of charges on the species produced in the reactions suggests they can be represented as:
(i) NaCl(s)
(ii) Na++Cl−
(iii) Na2S(s)
(iv) 2Na(s)+O2(g)
Ans: (ii) Na++Cl−
6. In a redox reaction, which of the following describes an oxidising agent?
(i) A species that gains electrons.
(ii) A species that loses electrons.
(iii) A product of the reaction.
(iv) A reactant that does not participate in electron transfer.
Ans: (i) A species that gains electrons.
7. What is the half reaction that represents reduction in the formation of sodium chloride?
(i) 2Na(s)→2Na+(g)+2e−
(ii) Cl2(g)+2e−→2Cl−(g)
(iii) 2NaCl(s)→2Na+(g)+2Cl−(g)
(iv) None of the above
Ans: (ii) Cl2(g)+2e−→2Cl−(g)
8.The oxidation number of an atom in the elemental state is:
(i) –1
(ii) 0
(iii) 1
(iv) 2
Ans: (ii) 0
9. The loss of electron is termed as
(i) Oxidation.
(ii) Reduction.
(iii) Combustion.
(iv) Neutralisation.
Ans: (i)Oxidation.
10. Find the oxidation state of I in H4IO6–
(i) +7
(ii) +5
(iii) +1
(iv) –1
Ans: (i) +7
11. Which of the following is not an example of redox reaction?
(i) CuO+H2→Cu+H2O
(ii) Fe2O3+3CO→2Fe+3CO2
(iii) 2K+F2→2KF
(iv) BaCl2+H2SO4→BaSO4+2HCl
Ans: (iv) BaCl2+H2SO4→BaSO4+2HCl
12. When a strip of metallic zinc is placed in an aqueous solution of copper nitrate the blue colour of the solution disappear due to formation of
(i) Zn2+
(ii) Cus
(iii) ZnS
(iv) Cu2+
Ans: (ii) Cus
13. Which of the following statements justifies the above dual behaviour of thiosulphate?
(i) Bromine is a stronger oxidant than iodine.
(ii) Bromine is a weaker oxidant than iodine.
(iii) Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions.
(iv) Bromine undergoes oxidation and iodine undergoes reduction in these reactions.
Ans. (i) Bromine is a stronger oxidant than iodine.
14. In the reaction Zn(s)+Cu2+(aq)→Zn2+(aq)+Cu(s), which species acts as the oxidising agent?
(i) Zinc.
(ii) Copper.
(iii) Zinc sulphate.
(iv) Hydrogen sulphide.
Ans: (ii) Copper.
15. The correct order of electron releasing tendency of the metals Cu, Zn and Ag is in the order
(i) Zn > Cu > Ag.
(ii) Zn > Ag > Cu.
(iii) Cu > Zn > Ag.
(iv) Ag > Zn > Cu.
Ans: (i) Zn > Cu > Ag.
