NCERT Class 11 Chemistry Chapter 8 Redox Reactions Very Short Questions And Answers

NCERT Solutions For Class 11 Chemistry Chapter 8 Redox Reactions Very Short Questions And Answers

Question 1. In which of the following two reactions does HNPO₃ not act as an oxidizing agent? Explain 
Answer: 2

Question 2. Which one of the following two reactions is a redox reaction?
Answer: 2

Question 3. Arrange the following compounds in increasing order of the oxidation number of S. Na₂S₄O₆, H₂S₂O₇, H₂SO₃, Na₂S₂O₃
Answer: Na₂S₂O₃ < Na₂S₄Og < H₂SO₃ < H₂S₂O₇

Read and Learn More NCERT Class 11 Chemistry Very Short Answer Questions

Question 4. Give an example of a compound In which The mime element exists In two different oxidation slates.
Answer: NH₄NO₃

Question 5. Given an example of a compound In which the oxidation number of N=+1.
Answer: N₂O

Question 6. Give an example of a compound In which the oxidation number of O r₂.
Answer: OF₂

Question 7. What Is the oxidation number of Fe In Po(CO)s?
Answer: Zero(0)

Question 8. What is the oxidation number of sodium In sodium amalgam?
Answer: Zero(0)

Question 9. Give an example of a compound In which the oxidation number and valency of an element In the compound are the same.
Answer: CCl₄

Question 10. What are the oxidation numbers of three C -atoms In C₃O₂?
Answer:

⇒ \(\mathrm{O}=\stackrel{+2}{\mathrm{C}}=\stackrel{0}{\mathrm{C}}=\stackrel{+2}{\mathrm{C}}=\mathrm{O},\)

Question 11. What Is the oxidation number of carbon In CCOCH₃?
Answer: -4/3

Question 12. What type of redox reaction does the given reaction belong to? \(2 \mathrm{H}_2 \mathrm{~S}+\mathrm{SO}_2 \rightarrow 2 \mathrm{H}_2 \mathrm{O}+3 \mathrm{~S}\)
Answer: Comproportlonation

Question 13. Which of the following Is unable to participate in disproportionation reaction? CIO-, ClO₂, ClO₃, ClO₄
Answer: CIO¯₄

Question 14. In which of the following ions does Fe exist in the same oxidation state? \(\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-},\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}^{2-}\right.\)
Answer: [Fe(CN₆)]_4‾ and [Fc(CN)gNO]^2-

Question 15. What is the equivalent mass of CuSO₄ in the given reaction? 2CuSO₄ + \(2 \mathrm{CuSO}_4+4 \mathrm{KI} \rightarrow \mathrm{Cu}_2 \mathrm{I}_2+\mathrm{I}_2+\mathrm{K}_2 \mathrm{SO}_4\)
Answer: M

Question 16. What is the average oxidation number of Fe in \(\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3\)?
Answer: \(+\frac{18}{7}\)

Question 17. Which one is the oxidizing agent in the given reaction: Which element In oxidized and which element Is reduced In the reaction, \(\mathrm{AsO}_2^{-}+\mathrm{Sn}^{2+} \rightarrow \mathrm{As}+\mathrm{Sn}^{4+}+\mathrm{H}_2 \mathrm{O}\)
Answer: AsO‾²

Question 18. Which element In oxidized and which element Is reduced In the reaction, 4KCIO₂(g) → 3KClO₄(g) + KCl(g)?
Answer: Cl is reduced and oxidized simultaneously

Question 19. How many moles of electrons will be required to reduce 1 mol NO₃ ion to hydrazine in the acidic medium?
Answer: 7 mol

Question 20. In an alkaline medium, ClO₂ oxidizes H₂O₂ to O₂ and itself reduces to Cl^– ion. How many moles of H₂O₂ will be oxidized by 1 mol of ClO₂?
Answer: 2.5 mol

Question 21. In the basic medium, KNO₂ is oxidized by KMnO₄, forming KNO₃. How many moles of KMnO₄ are required to oxidize 1 mol of KNO₂?
Answer: 2/3 mol

Question 22. Calculate— the number of mol of KMnO₄ required to oxidize 1 mol of ferrous oxalate in an acidic medium, The number of mol of K₂Cr₂O₇ required to oxidize 1 mol of ferrous oxalate in an acidic medium
Answer: 0.6 mol

Question 23. Calculate the equivalent mass of the underlined Compounds.
Answer: 183.75 16.5

NCERT Solutions For Class 11 Chemistry Chapter 8 Redox Reactions Fill In The Blanks

Question 1. Oxidation number of N in Mg₃N₂ is_________________.
Answer: -3

Question 2. An element can exist in +1, 0, +5 oxidation states. In a compound, if the element exists in a state, then the compound can participate in a disproportionation reaction.
Answer: +1

Question 3. The oxidation number of S in (CH₃)₂SO is_________________.
Answer: +4

Question 4. The number of electron(s) involved in the reaction, IO¯₃ →I‾ in basic medium, is_________________.
Answer: 6

Question 5. The equivalent mass of SO₂ in the reaction, SO₂ →\(\mathrm{SO}_4^{2-}\) in acidic medium is_________________.
Answer: 32

Question 6. \(\mathrm{CrO}_4^{2-}+x \mathrm{H}_2 \mathrm{O}+y e^{-} \rightarrow\left[\mathrm{Cr}(\mathrm{OH})_x\right]^{-}+x \mathrm{OH}^{-}\), where y =_________________.
Answer: 3

Question 7. The oxidation number of Mo in [Mo₂O₄-(C₂H₄)₂(H₂O₂)]²⁺ is_________________.
Answer: +5