Electrolysis

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

• At anode

• In the solution

• At the circuit

• At cathode

What are the ions present in molten Al₂O₃?

• Al²⁺ and O^3-

• Al^2- and O³⁺

• Al³⁺ and O^2-

• Al^3- and O²⁺

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

• Nothing

• pink solid deposit

• bubbles of green gas

• colourless gas

In an aqueous solution of copper chloride, which ions are attracted to the negative electrode?

• Cu²⁺ and Cl^- and H⁺ and OH^-
• Cu²⁺ and H⁺ 
•  Cl^- and OH^-
• Cu²⁺ 

Tags

NGSS.HS-PS2-5

Why ionic compounds can not conduct electricity when they are solid?

• their electrons are not free to move

• their ions are free to move

• their ions are not free to move

• their electrons are free to move

What is the equation to show what happens to chloride ions at the anode.

• Cl^- --> Cl + e-

• 2Cl^- --> Cl₂ + 2e-

• Cl₂ + 2e- 2Cl^-

• Cl₂ + 2e- _--> 2Cl^-

Tags

NGSS.HS-PS2-5

What are produced at positive/negative electrodes during electrolysis of molten NaCI?

• A
• B
• C
• D

Which factors affect amount of metal formed during electrolysis?

• I and II
• I and III
• II and III
• I, II and III

What occurs during electrolysis of a molten salt?

• Electricity is produced by a spontaneous redox reaction
• Electricity cause a non-spontaneous redox reaction to occur
• Electrons flow through the molten salt
• Electrons are removed from both ions of the molten salt

Tags

NGSS.HS-PS1-7

NGSS.HS-PS2-5

Object is electroplated with copper using copper(II) sulfate. Which statement is correct?

• Positive electrode increases in mass
• Concentration of Cu²⁺ ions in solution decreases
• Reduction occurs at positive electrode
• Reaction at negative electrode is Cu²⁺ + 2e^– → Cu

Tags

NGSS.HS-PS1-3