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Worksheet: Electrolysis of Molten Salts

Q1:

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

  • AMetal carbonates
  • BCarbon dioxide
  • CMetal sulfates
  • DMetal oxides
  • EMetal hydroxides

Q2:

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

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

Q3:

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

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

Q4:

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

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

Q5:

Aluminum is commonly extracted by electrolysis of aluminum oxide ( A l O ) 2 3 . Before it can be electrolyzed, the aluminum oxide must be molten. However, aluminum oxide has a melting point of over 2 0 0 0 C , which is very expensive to maintain. What is added to lower the melting point of the aluminum oxide before electrolysis?

  • A Water
  • BBauxite
  • C Aluminum
  • DCryolite
  • E Iron oxide