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Redox Reaction: Oxidizing and Reducing Agents 40 multiple choice

Total questions: 56

Worksheet time: 50mins

Name
Class
Date
1.

What is the oxidizing agent in the reaction: 2Fe + 3Cl2 -> 2FeCl3?

a)

Fe

b)

Cl2

c)

Fe2Cl3

d)

FeCl3

2.

Identify the reducing agent in the following reaction: 2K + 2H2O -> 2KOH + H2

a)

Hydrogen (H2)

b)

Potassium (K)

c)

Water (H2O)

d)

Oxygen (O2)

3.

In the reaction: Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag, which is the oxidizing agent?

a)

Cu(NO3)2

b)

Cu

c)

AgNO3

d)

Ag

4.

Which substance is being reduced in the reaction: 2Mg + O2 -> 2MgO?

a)

Oxygen (O2)

b)

Manganese (Mn)

c)

Magnesium (Mg)

d)

Mercury (Hg)

5.

Identify the oxidizing agent in the reaction: Zn + CuSO4 -> ZnSO4 + Cu

a)

Zn

b)

CuSO4

c)

ZnSO4

d)

Cu

6.

What is the reducing agent in the reaction: 2Na + Cl2 -> 2NaCl?

a)

Sodium (Na)

b)

Oxygen (O)

c)

Hydrogen (H)

d)

Chlorine (Cl)

7.

In the reaction: 2H2 + O2 -> 2H2O, which element is being oxidized?

a)

Water (H2O)

b)

Oxygen (O)

c)

Hydrogen (H)

d)

Carbon (C)

8.

Identify the reducing agent in the reaction: 2Al + 3CuCl2 -> 2AlCl3 + 3Cu

a)

Copper (Cu)

b)

Chlorine (Cl)

c)

Aluminum chloride (AlCl3)

d)

Aluminum (Al)

9.

Which substance is being oxidized in the reaction: 2HgO -> 2Hg + O2?

a)

HgO

b)

2Hg

c)

Hg

d)

O2

10.

In the reaction: 2Fe + 3O2 -> 2Fe2O3, which is the reducing agent?

a)

2Fe2O3

b)

O2

c)

Fe

d)

Fe2O3

11.

Consider the following equation:

6Na(s) + 2NH3(aq) → 2Na3N(s) + 3H2(g)

Which species acts as an oxidizing agent?

a)

N

b)

N in NH3

c)

H in NH3

d)

H2

12.

How many electrons are involved in the following half-reaction after it is balanced?

Cr2O72- + H+ + e- → Cr2+ + H2O

a)

2

b)

8

c)

12

d)

16

13.

Oxidation is the loss of electron, meaning, there is an increase of oxidation number

a)

True

b)

False

14.

Reduction is gaining of electron, meaning there is an increase in oxidation number.

a)

True

b)

False

15.

Passing electric current through aqueous solution/ molten state to form ions

a)

electrolysis

b)

electrolyte

c)

non electrolyte

16.

Nitric acid , sodium hydroxide are __________________electrolyte.

a)

weak

b)

strong

c)

none

17.

What does Le Chatelier's Principle state?

a)

Le Chatelier's Principle only applies to chemical reactions in a laboratory setting

b)

A system at equilibrium will not respond to any external changes

c)

If a system at equilibrium is disturbed, it will shift to counteract the disturbance and establish a new equilibrium.

d)

The equilibrium position of a system cannot be altered

18.

Define oxidation and reduction reactions.

a)

Oxidation is the gain of protons, reduction is the loss of protons.

b)

Oxidation is the gain of electrons, reduction is the loss of electrons.

c)

Oxidation is the loss of electrons, reduction is the gain of electrons.

d)

Oxidation is the gain of energy, reduction is the loss of energy.

19.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

20.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

21.

Which of these equations represents a redox reaction?

a)

Ca(HCO3)2 --> CaCO3 + H2O + CO2

b)

CH3COOH + NaOH --> CH3COONa + H2O

c)

Zn + 2FeCl3 --> ZnCl2 + 2FeCl2

d)

NaCl + AgNO3 --> AgCl + NaNO3

22.

Which of the following statements refers to an oxidation process?

a)

Hydrogen is added to ethene

b)

Oxygen is removed from carbon dioxide

c)

Chlorine accepts electrons

d)

Increase in the oxidation number of magnesium metal

23.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
24.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

25.

A substance which oxidises itself and reduces other is known as -

a)

oxidising agent

b)

reducing agent

c)

both of these

d)

none of these

26.

which of the following is a physical change?

a)

formation of curd from milk

b)

ripening of fruits

c)

Getting salt from sea water

d)

Burning of wood

27.

In a balanced electrochemical reaction, the number of electrons in the oxidation half reaction alwaysequals the number of electrons in the reduction half reaction.

a)

True

b)

False

28.

Which of the following is true?

a)

Combustion reactions are not an example of redox reactions.

b)

A metal rusting is a redox reaction.

c)

A metal dissolving in an acid is not an example of a redox reaction.

d)

Melting a solid into a liquid is an example of a redox reaction.

29.

Choose all the statements which contain correct definitions of reduction

a)

the removal of oxygen

b)

the removal of hydrogen

c)

the removal of electrons

d)

the decrease in oxidation state

30.

Which one of the following conversions is an example of reduction?

a)

Copper (II) oxide to copper (II) sulfate

b)

Copper (II) oxide to copper

c)

Hydrochloric acid to chlorine

d)

Lead (II) nitrate to lead (II) chloride

31.

An oxidizing agent will

a)

increase in mass

b)

lose electrons

c)

be reduced

d)

increase in oxidation number

32.

In a redox reaction, the species that loses electrons

a)

is called the cathode

b)

is oxidized

c)

gains mass at the electrode

d)

decreases in oxidation number

33.

Oxidation reaction involves:

a)

gain in oxygen

b)

loss of oxygen

c)

gain of hydrogen

d)

loss of hydrogen

e)

loss of electrons

34.

Reduction reaction involves (a)   of oxygen.

35.

A redox reaction is NOT:

a)

all reactions

b)

a combustion reaction

c)

a reduction-oxidation reaction

d)

a reaction in which electrons are transferred from one atom to another

36.

Combustion and single-replacement reactions are __________ redox reactions.

a)

always

b)

never

c)

sometimes

d)

mostly

37.

What is the meaning of a redox reaction?

Apakah maksud tindak balas redoks?

a)

Reduction reaction involved gain of electron.

Tindak balas penurunan melibatkan penerimaan elektron.

b)

Oxidation reaction involved loss of electron.

Tindak balas pengoksidaan melibatkan kehilangan elektron.

c)

Both oxidation and reduction reaction occurred simultaneously

Kedua-dua tindakbalas penurunan dan pengoksidaan yang berlaku serentak.

d)

A reaction involved gaining electron and losing hydrogen.

Tindak balas melibatkan penerimaan elektron dan kehilangan hidrogen.

38.

Which of the following statements refer to oxidation?

Pernyataan yang manakah merujuk kepada pengoksidaan?


I Process of losing oxygen

Proses kehilangan oksigen

II Process of gaining hydrogen

Proses penerimaan hidrogen

III Process of losing electrons

Proses kehilangan elektron

IV Process of increasing oxidation number

Proses penambahan nombor pengoksidaan

a)

I and II only

b)

III and IV only

c)

I, II and III only

d)

I, II , III and IV

39.

Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

a)

Make the ribbon surface shinier

b)

Remove the layer of magnesium oxide from the ribbon surface

c)

Remove the layer of magnesium carbonate from the ribbon surface

d)

Remove the moisture from the ribbon surface

40.

In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:

a)

Hydrochloric acid

b)

Barium sulphate

c)

Chlorine

d)

Sulphur

41.

Tick the correct answer.

Fe → Fe2+ + 2e-

a)

Oxidation

b)

Reduction

42.

Tick the correct answer

4OH- → 2H2O + O2 + 4e-

a)

Reduction

b)

Oxidation

43.

What is the substance that loses hydrogen in a redox reaction?

a)

oxidizing agent

b)

reducing agent

c)

is reduced

d)

decreases in oxidation number

44.

Which statement is true of a reducing agent?

a)

It is oxidised as it gains electrons.

b)

It is oxidised as it loses electrons.

c)

It is reduced as it gains electrons.

d)

It is reduced as it loses electrons.

45.
What element is being Oxidized?
a)
N
b)
H
c)
O
d)
S
46.
Is calcium oxidized or reduced in the following reaction? 
2 CaO--> 2 Ca + O2
a)
Oxidized
b)
Reduced
47.

Reduction is....

a)

Gain of electrons

b)

Loss of electrons

c)

Both the loss and gain of electrons

d)

None of these

48.

Oxidation is....

a)

Gain of electrons

b)

Loss of electrons

c)

Both the loss and gain of electrons

d)

None of these

49.

In redox reactions, what happens to the oxidising agent?

a)

It is oxidised

b)

It does not participate in the reaction and remains unchanged

c)

It is reduced

50.

In redox reactions, what happens to the reducing agent?

a)

It is oxidised

b)

It does not participate in the reaction and remains unchanged

c)

It is reduced

51.

Which of the following process involves the use of an oxidising agent?

a)

Acidified potassium permanganate being used to form ethanoic acid from ethanol

b)

Using carbon monoxide to obtain iron from iron ore in a blast furnace

c)

Lithium aluminium hydride being used to change propanone into propan-2-ol

52.

In redox reactions, what happens to the reducing agent?

a)

It is oxidised

b)

It does not participate in the reaction and remains unchanged

c)

It is reduced

53.

What is the oxidation number of iodine in KIO3?

a)

5

b)

1

c)

0

d)

-1

54.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

transfer

d)

share

55.

During the process of reduction, _________________

a)

protons are lost.

b)

protons are gained.

c)

electrons are lost.

d)

electrons are gained

e)

neutrons are lost.

56.

Substances that lose electrons easily and are oxidized in a chemical reaction are ____________.

a)

reducing agents

b)

coloring agents

c)

oxidizing agents

d)

neutralizing agents

e)

analytical agents

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