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
(i) 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
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.
