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electrolysis

Total questions: 55

Worksheet time: 45mins

Name
Class
Date
1.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
2.
What kind of Electrical Current does Electroysis require?
a)
Direct
b)
Indirect
c)
Anternative
d)
A alternating
3.
Which statement correctly describes the 2 electrodes?
a)
The anode is negative and the cathode is positive
b)
The anode and cathode are both positive
c)
The anode is positive and the cathode is negative
d)
The anode and cathode are both negative.
4.
What is the name given to the solution that is being electrolysed?
a)
Salt solution
b)
Electric solution
c)
Mineral solution
d)
Electrolyte
5.
Explain why the electrolyte has to be a liquid.
a)
So the ions can move
b)
So the electrons can move
c)
So that it doesn't get too hot
d)
So the fish are ok
6.

It is essetial that the electrolyte is a liquid so that...

a)

Charged ions can not migrate towards the electrodes.

b)

Charged ions can migrate towards the electrodes.

c)

The solution can move around.

d)

The current can flow through it.

7.
What happens at the positive electrode?
a)
Positive non-metal ions are attracted
b)
Positive metal ions are attracted
c)
Negative non-metal ions are attracted
d)
Negative metal ions are attracted
8.
Positive ions (cations) will move towards the cathode (-) where they will discharge by....
a)
Breaking apart
b)
Losing electrons
c)
Clumping together.
d)
Gaining electrons
9.

When NaCl solution is electrolysed what forms at the anode?

a)

Hydrogen

b)

Oxygen

c)

Chlorine

d)

Sodium

10.
What does the Cathode (-) do to ions?
a)
Give electrons to the Positive ions to turn them back into atoms
b)
Take electrons from the positive ions?
c)
Turn ions back into atoms by removing electrons
d)
Turn atoms into ions by adding electrons
11.
What is the equation to show what happens to Cl ions at the anode.
a)
Cl- --> Cl + e-   
b)
2Cl- --> Cl2 + 2e-   
c)
Cl2 + 2e-   2Cl- 
d)
Cl2 + 2e-  -->  2Cl- 
12.

Choose the half-equation that shows the discharge of aluminium ion.

a)

Al3+ - 3e- --> Al

b)

Al2+ + 3e- --> Al

c)

Al3+ + 3e- --> Al

d)

Al3+ --> Al + 3e-

13.

Ionic compounds do not conduct electricity when they are solid because,

a)

their electrons are not free to move

b)

their ions are free to move

c)

their ions are not free to move

d)

their electrons are free to move

14.
In an aqueous solution of copper chloride, which ions are attracted to the negative electrode?
a)
Cu2+ and Cl- and H+ and OH-
b)
Cu2+ and H+ 
c)
 Cl- and OH-
d)
Cu2+ 
15.

What change is observed at cathode during electrolysis of aqueous copper(II) chloride using carbon electrode

a)

Nothing

b)

pink solid deposit

c)

bubbles of green gas

d)

colourless gas

16.

What are the ions present in molten Al2O3?

a)

Al2+ and O3-

b)

Al2- and O3+

c)

Al3+ and O2-

d)

Al3- and O2+

17.

Oxidation is loss of electron. Where does oxidation take place during electrolysis.

a)

At anode

b)

In the electrolyte

c)

At the circuit

d)

At cathode

18.

The diagram shows the electrolysis of lead(II) bromide using inert electrodes. Why does the bulb only light up when the lead(II) bromide is melted?

a)

Bromine atoms in lead(II) bromide are converted to ions when it is melted

b)

Electrons flow through the lead(II) bromide when it is melted

c)

The ions in lead(II) bromide are mobile charge carriers in the molten state.

d)

There are no ions in solid lead(II) bromide

19.
What particle carries the charge in the wire?
a)
electron
b)
proton
c)
ion
d)
atom
20.
What particle carries the charge in the electrolyte?
a)
electron
b)
proton
c)
ion
d)
atom
21.
When NaCl solution is electrolysed what has forms at the anode?
a)
Hydrogen
b)
Oxygen
c)
Chlorine
d)
Sodium
22.

What is the half-equation for the discharge of hydroxide ions?

a)

2O2- --> O2 + 4e-

b)

OH- --> OH + e

c)

4OH- --> 2H2O + O2 + 4e-

d)

2H2O + O2 + 4e- --> 4OH-

23.

The picture shows electrolysis of copper(II) sulphate solution using graphite electrodes. Besides formation of brown solid on the cathode, what other observations can be made?

a)

The mass of graphite anode decreases.

b)

The blue colour solution becomes paler.

c)

Bubbles of gas form at the anode.

d)

The blue colour solution becomes darker.

24.

What are the products at the electrodes when dilute sulfuric acid is electrolysed using inert electrodes?

a)

A

b)

B

c)

C

d)

D

25.

Electricity is passed separately through concentrated hydrochloric acid, concentrated aqueous

sodium chloride and dilute sulfuric acid.

In which rows are the electrolysis products correctly named?

a)

1, 2 and 3

b)

1 and 2 only

c)

1 and 3 only

d)

2 and 3 only

26.

Which row describes the electrolysis of molten potassium bromide?

a)

A

b)

B

c)

C

d)

D

27.

What are the electrode products when molten silver iodide is electrolysed between inert electrodes?

a)

A

b)

B

c)

C

d)

D

28.

Copper and hydrogen can each be formed by electrolysis.

At which electrodes are these elements formed?

a)

A

b)

B

c)

C

d)

D

29.
What is the name of a negatively charged ion?
a)
negatron
b)
electron
c)
cation
d)
anion
30.
What is the name of a positively charged ion?
a)
positron
b)
proton
c)
cation
d)
anion
31.
What is the name of a negatively charged electrode?
a)
cathode
b)
anode
c)
cation
d)
anion
32.
What is the name of a positively charged electrode?
a)
cathode
b)
anode
c)
cation
d)
anion
33.
What occurs during electrolysis of a molten salt?
a)
Electricity is produced by a spontaneous redox reaction
b)
Electricity cause a non-spontaneous redox reaction to occur
c)
Electrons flow through the molten salt
d)
Electrons are removed from both ions of the molten salt
34.
Object is electroplated with copper using copper(II) sulfate. Which statement is correct?
a)
Positive electrode increases in mass
b)
Concentration of Cu2+ ions in solution decreases
c)
Reduction occurs at positive electrode
d)
Reaction at negative electrode is Cu2+ + 2e– → Cu
35.

Choose all the inert electrodes:

a)

iron

b)

nickel

c)

graphite

d)

platinum

36.

The electrolytic deposition of a superior metal on a baser metal is:

a)

electro-refining

b)

electro-plating

c)

electro-metallurgy

d)

electrolysis

37.

Which is the correct electrochemical series?

a)

Na, Al, Fe, Mg, Zn

b)

Mg, Fe, Zn, Na, Al

c)

Na, Mg, Al, Zn, Fe

d)

Fe, Zn, Na, Mg, Al

38.

Choose all the correct reasons for electroplating:

a)

Improves the electrical conductivity of the article.

b)

Prevents corrosion or rusting of the base metal.

c)

Makes the article dull.

d)

Makes the article attractive.

39.

During electroplating an article with silver, the electrolyte used is:

a)

silver nitrate solution

b)

silver cyanide solution

c)

sodium argentocyanide solution

d)

nickel sulphate solution

40.

The blue colour of aq. Copper[II] sulphate solution ________ during electrolysis of aq. CuSO4 using copper electrodes, but ______ when platinum electrodes are used.

a)

remains unchanged ; fades

b)

remains unchanged; remains unchanged

c)

fades ; fades

d)

None of the above

41.

The particles in weak electrolytes are:

a)

molecules only

b)

ions and unionised molecules

c)

ions only

d)

All of the above

42.

The preferential discharge of the ions depends on its position in the (a)   series.

43.

When silver is being electroplated onto the cup,

a)

the cup is at the anode.

b)

silver is at the anode.

c)

the electrolyte is aqueous gold nitrate

44.
Which factors affect amount of metal formed during electrolysis?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
45.
Which are used for electroplating of a metal spoon with copper?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
46.
Which statement is correct on electrolysis of aqueous copper(II) sulfate using graphite electrodes?
a)
Colourless gas is produced at negative electrode
b)
Electrolyte does not change colour
c)
Negative electrode decreases in mass
d)
Colourless gas is produced at positive electrode
47.

When NaCl solution is electrolysed what has forms at the cathode?

a)

Hydrogen

b)

Oxygen

c)

Chlorine

d)

Sodium

48.

The diagram shows an electrolysis experiment.

During the electrolysis, sodium was formed at electrode P and chlorine at electrode Q.

Which choice correctly identifies P, Q and X?

a)

P = anode; Q = cathode; X = concentrated solution of sodium chloride in water

b)

P = anode; Q = cathode; X = molten sodium chloride

c)

P = cathode; Q = anode; X = concentrated solution of sodium chloride in water

d)

P = cathode; Q = anode; X = molten sodium chloride

49.

The diagram shows the electrolysis of aqueous sodium chloride.


Which choice correctly identifies P, Q and X?

a)

P = Hydrogen Q = Oxygen; X = sodium chloride solution

b)

P = Sodium Q = Chlorine; X = water

c)

P = Sodium; Q = Oxygen X = hydrochloric acid solution

d)

P = Hydrogen Q = Chlorine X = sodium hydroxide solution

50.
a)

A

b)

B

c)

C

d)

D

51.
What is the removal of oxygen from a substance called?
a)
reduction
b)
extraction
c)
electrolysis
d)
oxidation
52.

Identify the weak electrolyte

a)

NaCl soln

b)

dil HCl soln

c)

dil H2SO4

d)

aq acetic acid

53.

Which of the following will act as non electrolyte?

a)

Liq CCl4

b)

CH3COOH

c)

Aq. NaOH

d)

Aq. KCl soln

54.

Diagram shows an electrolytic cell.

Which of the substances cause the bulb to light up when electricity passes through it?

a)

Ethanol

b)

Dilute ethanoic acid

c)

Solid lead(II) bromide

d)

Tetrachloromethane

55.

Molten X is electrolysed using carbon electrodes. After 10 minutes, a brown solid is deposited on the cathode and a brown gas is released at the anode. What is molten X?

a)

Lead(II) chloride

b)

Lead(II) bromide

c)

Copper(II) chloride

d)

Copper(II) bromide

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