Oxidation And Reduction In Terms Of Electron Transfer Jamb Chemistry Past Questions
Question 11
H\(_2\) S\(_{(g)}\) + Cl\(_{2(g)}\) → 2HCl\(_{(g)}\) + S\(_{(g)}\) In the reaction above, the substance that is reduced is
- A. H\(_2\)S
- B. S
- C. HCl
- D. Cl\(_2\)
Question 12
Which of the following reactions is an oxidation process?
- A. 2H\(^+\) + 2e\(^-\) \(\to\) H\(_2\)
- B. 2O\(^{2-}\) + 4e\(^-\) \(\to\) O\(_2\)
- C. OCl\(^-\) + H\(_2\)O + 2e\(^-\) \(\to\) 2OH\(^-\) + Cl\(^-\)
- D. Cl + e\(^-\) \(\to\) Cl\(^-\)
Question 13
Consider the equation below:
Cr\(_2\)O\(_7 ^{2-}\) + 6Fe\(^{2+}\) + 14H\(^{+}\) \(\to\) 2Cr\(^{3+}\) + 6Fe\(^{3+}\) + 7H\(_2\)O.
The oxidation number of chromium changes from
- A. +5 to +3
- B. +6 to +3
- C. -2 to +3
- D. +7 to +3
Question 14
The oxidation state(s) of nitrogen in ammonium nitrite is/are
- A. -3, +3
- B. +5
- C. -3, +5
- D. -3
Question 15
The reaction \(2H_2 S + SO_2 \to 3S + 2H_2 O\) is
- A. not a redox reaction because there is no oxidant in the reaction
- B. not a redox reaction because there is no reductant in the reaction
- C. a redox reaction in which H\(_2\)S is the oxidant and SO\(_2\) is the reductant
- D. a redox reaction in which SO\(_2\) is the oxidant and H\(_2\)S is the reductant
