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Oxidation-Reduction Reactions Questions - All Grades

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Grade 12 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Consider the following redox reaction:

[math]H_2C_2O_4 (aq) + MnO_4^(-) (aq) rarr CO_2(g) + Mn^(2+) (aq) [/math]

What is the reduction half reaction for this redox reaction?
  1. [math](Mn)^(7+) (aq) rarr Mn^(2+) (aq) [/math]
  2. [math]H_2C_2O_4 (aq) rarr CO_2(g)[/math]
  3. [math](MnO_4)^(-) (aq) + 8H^(+) (aq) rarr Mn^(2+) (aq) + 4H_2O (l)[/math]
  4. [math]H_2C_2O_4 (aq) rarr 2CO_2 (g) + 2H^(+) (aq)[/math]
Grade 12 Oxidation-Reduction Reactions
The oxidation number of I in HOI is                .
  1. [math]-1[/math]
  2. [math]0[/math]
  3. [math]-2[/math]
  4. [math]+1[/math]
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
What represents the total oxidation state for an ionic compound?
  1. It equals the charge of the cation.
  2. It equals the charge of the anion.
  3. It is equivalent to the magnitude of the ion with the higher charge.
  4. It equals zero.
Grade 11 Oxidation-Reduction Reactions
Which chemical equation shows a redox reaction?
  1. [math]CH_3COOH + NaOH -> CH_3COONa + H_2O[/math]
  2. [math]Cl^(-) + Ag^(+) ->AgCl darr[/math][math][/math]
  3. [math]5Fe^(2+) + MnO_4^(1-) + 8H_3O^+ rArr6Fe^(3+) + Mn^(2+) + 12H_2O[/math]
  4. [math]HCl + NaOH -> NaCl + H_2O[/math]
Grade 10 Oxidation-Reduction Reactions
Which of the following always occurs in an oxidation-reduction reaction?
  1. a reactant loses a proton
  2. a reactant loses two neutrons
  3. a reactant gains sulfur
  4. a reactant gains protons and neutrons
  5. one reactant gains electrons, and the other reactant(s) lose an equal number of electrons
Grade 12 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Consider the following redox reaction:

[math]CH_4 (g) + O_2(g) rarr CO_2(g) + 2H_2O (l)[/math]

What is the change in the oxidation number of carbon in this reaction?
  1. It increases from -4 to +4.
  2. It decreases from +4 to 0.
  3. It increases from +4 to -3.
  4. It decreases from +4 to -2.
Grade 12 Oxidation-Reduction Reactions
The oxidation number of Cl in [math]KClO_3[/math] is                .
  1. [math]-1[/math]
  2. [math]-5[/math]
  3. [math]+1[/math]
  4. [math]+5[/math]
Grade 11 Oxidation-Reduction Reactions
What would the oxidation number of a xenon atom be, and what would this oxidation number suggest?
  1. Its oxidation number is 8, making it inert.
  2. Its oxidation number is 0, making it nonreactive.
  3. Its oxidation number is 7, making it reactive.
  4. Its oxidation number is 0, making it reactive.
Grade 12 Oxidation-Reduction Reactions
The oxidation number of H in [math]AlH_3[/math] is                .
  1. [math]+1[/math]
  2. [math]-1[/math]
  3. [math]+3[/math]
  4. [math]0[/math]
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Which species oxidizes another in the following redox reaction?
[math]3H_3AsO_3(aq) + BrO_3^(-) (aq) rarr Br^(-) (aq) + 3H_3AsO_4(aq)[/math]?
  1. [math]BrO_3^(-) (aq)[/math]
  2. [math]H_3AsO_3[/math]
  3. [math]Br^(_) (aq)[/math]
  4. [math]H_3AsO_4[/math]
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
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