MCQs on Class 11 Redox Reactions: Redox reactions which stands for reduction-oxidation reactions, is a crucial component of chemistry education. They involve the transfer of electrons between chemical species, resulting in a change in the oxidation states and the transformation of substances. In this article, we have curated a diverse set of MCQs for Class 11 Chemistry Chapter - 7 to help students test and enhance their understanding of redox reactions. These MCQs will serve as a valuable tool in your journey to mastering the intricacies of redox reactions and securing high marks in the CBSE Class 11 Chemistry Exam 2023-24. These questions have been prepared based on the questions asked in the previous years’ exams to bring for you the exam-centred study material. To strengthen your understanding of these concepts and prepare effectively for exams, we recommend practising all the questions. You can access and download all the questions and answers in PDF format here.
Check MCQs with Answers for Class 11 Chemistry Chapter - Redox Reactions below:
1.The oxidation number of an atom in the elemental state is:
Answer: (b) 0
2.Find the oxidation state of I in H4IO6–
Answer: (a) +7
3.The oxidation number of iron in Fe3O4 is
Answer: (c) 8/3
4.A standard hydrogen electrode has zero electrode potential because
(a) hydrogen is easiest to oxidize
(b) the electrode potential is assumed to be zero
(c) hydrogen atom has only one electron
(d) hydrogen is the lightest element
Answer: (d) hydrogen is the lightest element
5. Values of standard electrode potential of three metals X, Y and Z are -1.2V, +0.5V and -3.0V respectively. The reducing power of these metals will be in order
Answer: (d) Z>X>Y
6.The values of x and y in the following reaction,
xCl2 + 6OH– (hot & conc.) → ClO3– + 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
7.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?
(a) The oxidation number of hydrogen is always +1.
(b) The algebraic sum of all the oxidation numbers in a compound is zero.
(c) An element in the free or the uncombined state bears oxidation number zero.
(d) In all its compounds, the oxidation number of fluorine is –1.
Answer: (a) The oxidation number of hydrogen is always +1.
8.In the reaction 3Br2 + 6CO32– + 3H2O → 5Br– + BrO3– + 6HCO3–
(a) bromine is oxidised and carbonate is reduced
(b) bromine is reduced and water is oxidised
(c) bromine is neither reduced nor oxidised
(d) bromine is both reduced and oxidised
Answer: (d) bromine is both reduced and oxidised
9.H2SO4 acts as a strong oxidising agent. In which of the reaction, is it not acting as an oxidising agent?
(a) C + 2H2SO4 → CO2 + 2SO2 + 2H2O
(b) CaF2 + 2H2SO4 → CaSO4 + 2HF
(c) S + 2H2SO4 → 3SO2 + H2O
(d) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
Answer: (b) CaF2 + 2H2SO4 → CaSO4 + 2HF
10.In which of the following compounds, ‘Mn’ exhibits highest oxidation state?
Answer: (a) KMnO4