Free Printable Understanding Oxidation and Reduction

1.

Which of the following best describes oxidation in a chemical reaction?

a)

Gain of hydrogen

b)

Loss of electrons

c)

Gain of electrons

d)

Loss of oxygen

2.

Which of the following is a reducing agent in a redox reaction?

a)

The substance that gains electrons

b)

The substance that loses electrons

c)

The substance that is oxidized

d)

Both B and C

3.

In the reaction $2\text{Na} + \text{Cl}_2 \rightarrow 2\text{NaCl}$ , which element is reduced?

a)

Sodium

b)

Chlorine

c)

Both sodium and chlorine

d)

Neither sodium nor chlorine

4.

Which of the following is always true for a redox reaction?

a)

Only oxidation occurs

b)

Only reduction occurs

c)

Both oxidation and reduction occur simultaneously

d)

Neither oxidation nor reduction occurs

5.

Which of the following reactions is an example of oxidation?

a)

$\text{Fe}^{2+} \rightarrow \text{Fe}^{3+} + e^-$

b)

$\text{Cl}_2 + 2e^- \rightarrow 2\text{Cl}^-$

c)

$\text{Cu}^{2+} + 2e^- \rightarrow \text{Cu}$

d)

$\text{O}_2 + 4e^- \rightarrow 2\text{O}^{2-}$

6.

Which of the following statements is correct about reduction?

a)

It involves loss of electrons

b)

It involves gain of electrons

c)

It involves loss of hydrogen

d)

It involves gain of oxygen

7.

In the reaction $\text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu}$ , which substance is oxidized?

a)

Zn

b)

Cu

c)

SO $_4^{2-}$

d)

Both Zn and Cu

8.

Which of the following is NOT a redox reaction?

a)

$\text{H}_2 + \text{Cl}_2 \rightarrow 2\text{HCl}$

b)

$\text{AgNO}_3 + \text{NaCl} \rightarrow \text{AgCl} + \text{NaNO}_3$

c)

$\text{Zn} + 2\text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2$

d)

$\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2$

9.

Which of the following is a characteristic of a reducing agent?

a)

It gains electrons

b)

It is reduced

c)

It loses electrons

d)

It does not participate in the reaction

10.

In the reaction $\text{CuO} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2\text{O}$ , what role does hydrogen play?

a)

Oxidizing agent

b)

Reducing agent

c)

Catalyst

d)

Product

11.

Which of the following is the oxidizing agent in the reaction $\text{Zn} + \text{Cu}^{2+} \rightarrow \text{Zn}^{2+} + \text{Cu}$ ?

a)

Zn

b)

Cu

c)

Cu $^{2+}$

d)

Zn $^{2+}$

12.

Which of the following processes involves reduction?

a)

$\text{Fe}^{3+} + e^- \rightarrow \text{Fe}^{2+}$

b)

$\text{Na} \rightarrow \text{Na}^+ + e^-$

c)

$\text{Cl}^- \rightarrow \text{Cl}_2 + 2e^-$

d)

$\text{O}_2 \rightarrow 2\text{O}^{2-} + 4e^-$

13.

Which of the following is true about redox reactions?

a)

Electrons are transferred from one substance to another

b)

No electrons are transferred

c)

Only ions are involved

d)

Only covalent compounds are involved

14.

In the reaction $2\text{H}_2\text{S} + \text{O}_2 \rightarrow 2\text{H}_2\text{O} + 2\text{S}$ , which substance is oxidized?

a)

H $_2$ S

b)

O $_2$

c)

H $_2$ O

d)

S

15.

Which of the following is an example of a redox reaction in everyday life?

a)

Rusting of iron

b)

Dissolving sugar in water

c)

Melting of ice

d)

Boiling of water

Understanding Oxidation and Reduction

Total questions: 15

Worksheet time: 8mins

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