High School: 9th and 10th Grade - Chemistry - Electrolysis 2 Solution - MCQGeeks.com

Q.1.

What gas forms at the positive electrode during the extraction of aluminum?

67%
Hydrogen
33%
Chlorine
0%
Nitrogen
0%
Oxygen

Q.2.

The third product from the electrolysis of brine is sodium hydroxide. This is NOT used to...

33%
make bleach
33%
make paper
33%
make soap
0%
make margarine

Q.3.

Copper can be purified using electrolysis. Pick the correct combination of components for the electrolytic cell.

0%
Cathode: Impure copper Anode: Pure copper Electrolyte: Copper sulfate
50%
Cathode: Pure copper Anode: Impure copper Electrolyte: Copper sulfate
50%
Cathode: Pure copper Anode: Pure copper Electrolyte: Copper sulfate
0%
Cathode: Impure copper Anode: Pure copper Electrolyte: Water

Q.4.

The hydrogen produced by the electrolysis of brine is NOT used to...

33%
make margarine
67%
make bleach
0%
make hydrochloric acid
0%
make hydrogen chloride gas

Q.5.

Pick the correct half equations for the electrolysis of copper sulfate using copper electrodes.

0%
Cathode: Cu(s) → Cu2+(aq) + 2e- Anode: Cu2+(aq) + 2e- → Cu(s)
100%
Cathode: Cu2+(aq) + 2e- → Cu(s) Anode: Cu(s)→ Cu2+(aq) + 2e-
0%
Cathode: Cu(s) → Cu+(aq) + e- Anode: Cu2+(aq) + 2e- → Cu(s)
0%
Cathode: Cu(s) → Cu2+(aq) + 2e- Anode: Cu+(aq) + e- → Cu(s)

Q.6.

Aluminum ore (bauxite) must be dissolved in molten cryolite before it can be electrolysed. Why?

0%
Raise the melting point
100%
Lower the melting point
0%
Increase its viscosity
0%
Reduce its viscosity

Q.7.

When an electrical current is passed through brine (sodium chloride solution), three products are formed. They are...

0%
chlorine gas, hydrogen gas, sodium chloride solution
100%
chloride ions, hydrogen gas, sodium hydroxide solution
0%
chlorine gas, hydrogen gas, sodium hydroxide solution
0%
chlorine gas, hydrogen ions, sodium hydroxide solution

Q.8.

If graphite electrodes are used instead of copper in the electrolysis of copper sulfate, the equation that shows what happens at the anode is...

50%
H2O → H+ + O2 + e-
50%
Cu2+ + 2e- → Cu
0%
2H2O → 4H+ + O2+ 4e-
0%
Cu → Cu 2+ +2e-

Q.9.

Choose the correct half equations for the electrolysis of brine.

0%
Anode 2Cl- → Cl2 + 2e- Cathode 2H+ + 2e- → H2
100%
Anode Cl- → Cl2 + e- Cathode 2H+ + e- → H2
0%
Anode 2Cl- → Cl2 + 2e- Cathode Na+ + e- → Na
0%
Anode Cl- → Cl + 2e- Cathode H+ + e- → H2

Q.10.

Which of the following is NOT a use for chlorine?

0%
Kill bacteria
50%
Make bleach
0%
Make PVC
50%
Control pH