Redox Reactions Quiz

1

In the reaction: Zn + 2H⁺ + 2Cl⁻ → Zn²⁺ + 2Cl⁻ + H₂, which are the spectator ions?

Zn and H⁺ H⁺ and Zn²⁺ Cl⁻ Zn²⁺ and H₂

2

Which of the following is NOT a method of oxidation?

Addition of oxygen Removal of hydrogen Addition of hydrogen Loss of electrons

3

In the reaction 2Mg + O₂ → 2MgO, magnesium is:

Reduced Oxidized Both oxidized and reduced Neither

4

Which is an example of intramolecular redox reaction?

2Al + Fe₂O₃ → Al₂O₃ + 2Fe 2KClO₃ → 2KCl + 3O₂ Zn + 2HCl → ZnCl₂ + H₂ Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

5

The strongest oxidizing agent among the following is:

Cl₂ O₂ F₂ Br₂

6

Which compound can act as both oxidizing and reducing agent?

KMnO₄ H₂O₂ K₂Cr₂O₇ HNO₃

7

The equivalent weight of KMnO₄ in acidic medium is:

Mol. wt./3 Mol. wt./5 Mol. wt./1 Mol. wt./7

8

In [Fe(CN)₆]⁴⁻ → [Fe(CN)₆]³⁻, the change in oxidation number of Fe is:

+2 to +3 +3 to +2 0 to +1 +1 to 0

9

Which of the following has fractional oxidation number?

NaCl S₈ S₂O₃²⁻ O₂

10

The oxidation number of Cl in HClO₄ is:

+5 +7 +3 -1

11

In Stock nomenclature, FeCl₃ is named as:

Iron(III) chloride Iron(II) chloride Ferric chloride Ferrous chloride

12

The equivalent weight of C₂O₄²⁻ when it is converted to CO₂ is:

Mol. wt./1 Mol. wt./2 Mol. wt./3 Mol. wt./4

13

Which is a direct redox reaction?

Daniel cell Electrolysis of water 2Al + Fe₂O₃ → Al₂O₃ + 2Fe Galvanic cell

14

The oxidation number of oxygen in H₂O₂ is:

-2 -1 0 +1

15

Which of the following is a reducing agent?

KMnO₄ K₂Cr₂O₇ SnCl₂ HNO₃

16

In the reaction: Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O, H₂SO₄ acts as:

Only oxidizing agent Only acid Both oxidizing agent and acid Neither

17

The oxidation state of S in S₂O₃²⁻ is:

+2 +6 +2.5 -2

18

Which of the following has the highest oxidation state of the central atom?

HClO HClO₂ HClO₃ HClO₄

19

The equivalent weight of H₂O₂ when it acts as reducing agent (H₂O₂ → O₂) is:

Mol. wt./1 Mol. wt./2 Mol. wt./17 34

20

In the reaction: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O, Mn is:

Oxidized Reduced Both Neither