Worksheet: Uses of Electrolysis

In this worksheet, we will practice describing industrial conditions and applications for the electrolysis of molten salts and salt solutions.

Q1:

Which of the following would be the best choice of starting material for the production of a large quantity of oxygen by electrolysis?

  • ACarbon dioxide
  • BMetal sulfates
  • CMetal oxides
  • DMetal carbonates
  • EMetal hydroxides

Q2:

Which molten salt would produce sodium metal and chlorine gas when electrolyzed?

  • A M g C l 2
  • B N a F
  • C N a C l
  • D N a B r
  • E A l C l 3

Q3:

Which one of the following molten salts would not produce sodium metal when electrolyzed?

  • A M g C l 2
  • B N a B r
  • C N a F
  • D N a C l
  • E N a O 2

Q4:

Which molten salt would produce magnesium metal and bromine gas when electrolyzed?

  • A M g B r 2
  • B N a C l
  • C B a B r 2
  • D A l B r 3
  • E M g C l 2

Q5:

Aluminum is commonly extracted by electrolysis of aluminum oxide (AlO)23. Before it can be electrolyzed, the aluminum oxide must be molten. However, aluminum oxide has a melting point of over 2,000C, which is very expensive to maintain. What is added to lower the melting point of the aluminum oxide before electrolysis?

  • AAluminum
  • BCryolite
  • CBauxite
  • DWater
  • EIron oxide

Q6:

What is the product at the cathode when copper(II) chloride is electrolyzed in aqueous solution?

  • AHydrogen
  • BCopper hydroxide
  • CCopper
  • DCopper chloride
  • EWater

Q7:

What is the product at the cathode when sodium chloride is electrolyzed in aqueous solution?

  • AHydrogen
  • BWater
  • CSodium hydroxide
  • DSodium chloride
  • ESodium

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