Oxidation and reduction concepts, oxidation numbers, balancing redox reactions - One Line Questions

1. What is the oxidation number of an element in its free and uncombined state? — 0
2. In the compound $H_2O_2$ (hydrogen peroxide), what is the oxidation number of Oxygen? — -1
3. What is the oxidation number of Hydrogen when bonded to non-metals? — +1
4. What is the oxidation number of Hydrogen when bonded to metals? — -1
5. What is the oxidation number of Oxygen in most of its compounds? — -2
6. In the polyatomic ion $SO_4^{2-}$, what is the oxidation number of Sulfur (S)? — +6
7. What is the oxidation number of Carbon in $CO_2$? — +4
8. What is the oxidation number of Nitrogen in $NO_2$? — +4
9. In the reaction $C + O_2 → CO_2$, Carbon is oxidized from an oxidation state of 0 to: — +4
10. In the reaction $MnO_4^- + 5Fe^{2+} + 8H^+ → Mn^{2+} + 5Fe^{3+} + 4H_2O$, the oxidation number of Manganese changes from: — +7 to +2
11. What is the oxidation number of Nitrogen in $NH_3$? — -3
12. In the reaction $MnO_4^- + 5Fe^{2+} + 8H^+ → Mn^{2+} + 5Fe^{3+} + 4H_2O$, the oxidation number of Iron changes from: — +2 to +3
13. What is the oxidation number of Carbon in $CH_4$? — -4
14. What is the oxidation number of Phosphorus in $P_4O_{10}$? — +5
15. What is the oxidation number of Chromium in $K_2Cr_2O_7$? — +6
16. What is the oxidation number of Manganese in $KMnO_4$? — +7
17. Which of the following is an example of disproportionation reaction? — $2H_2O_2 → 2H_2O + O_2$
18. In acidic medium, to balance a redox reaction, which species is added to balance oxygen atoms? — $H_2O$
19. In acidic medium, to balance a redox reaction, which species is added to balance hydrogen atoms? — $H^+$
20. In basic medium, to balance a redox reaction, which species is added to balance oxygen atoms? — $H_2O$
21. In basic medium, to balance a redox reaction, which species is added to balance hydrogen atoms? — $OH^-$
22. Which of the following reactions is NOT a redox reaction? — $HCl + NaOH → NaCl + H_2O$
23. Which of the following is an example of intramolecular redox reaction? — $KClO_3 → KCl + O_2$
24. In the reaction $2Na + Cl_2 → 2NaCl$, what is the oxidation number of Sodium (Na)? — +1
25. In the reaction $2Na + Cl_2 → 2NaCl$, what is the oxidation number of Chlorine (Cl)? — -1
26. What is the oxidation number of Fluorine in all its compounds? — -1
27. Balancing redox reactions in basic medium typically involves adding $OH^-$ and $H_2O$ to balance oxygen and hydrogen atoms respectively, and then: — Adding electrons to balance charge
28. The sum of oxidation numbers of all atoms in a neutral molecule is: — Zero
29. In the reaction $SO_2 + 2H_2S → 3S + 2H_2O$, Sulfur dioxide ($SO_2$) acts as: — An oxidizing agent
30. In the reaction $SO_2 + 2H_2S → 3S + 2H_2O$, Hydrogen sulfide ($H_2S$) acts as: — A reducing agent
31. To balance a redox reaction using the oxidation number method, the change in oxidation numbers on both sides must be: — Equal
32. The half-reaction representing oxidation is: — Loss of electrons
33. The half-reaction representing reduction is: — Gain of electrons
34. In balancing a redox reaction by the ion-electron method, electrons are added to balance: — Charge
35. In a chemical reaction, the gain of electrons is called: — Reduction
36. The process of losing oxygen or gaining hydrogen is considered: — Reduction
37. Which statement is correct regarding redox reactions? — Oxidation and reduction occur simultaneously.
38. In the reaction $Zn + CuSO_4 → ZnSO_4 + Cu$, Zinc is: — Oxidized
39. In the reaction $Zn + CuSO_4 → ZnSO_4 + Cu$, Copper is: — Reduced
40. In the reaction $I_2 + S_2O_3^{2-} → 2I^- + S_4O_6^{2-}$, Iodine ($I_2$) is: — Reduced
41. In the reaction $I_2 + S_2O_3^{2-} → 2I^- + S_4O_6^{2-}$, Thiosulfate ion ($S_2O_3^{2-}$) is: — Oxidized
42. The species that gets oxidized in a redox reaction is the: — Reducing agent
43. The species that gets reduced in a redox reaction is the: — Oxidizing agent
44. Which of the following is a reducing agent? — Hydrogen Sulfide ($H_2S$)
45. Which element is oxidized in the reaction $2KMnO_4 + 16HCl → 2KCl + 2MnCl_2 + 5Cl_2 + 8H_2O$? — Chlorine (Cl)
46. Which element is reduced in the reaction $2KMnO_4 + 16HCl → 2KCl + 2MnCl_2 + 5Cl_2 + 8H_2O$? — Manganese (Mn)
47. Which process involves the loss of electrons? — Oxidation
48. The process of gaining oxygen or losing hydrogen is considered: — Oxidation
49. Which of the following is an oxidizing agent? — Potassium Dichromate ($K_2Cr_2O_7$)
50. The oxidation number of an element in an ion is equal to: — The charge of the ion
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