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12 questions
Ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile . . .
recycling the element
extracting the metal
to set up a mine
to use the metal
Which of these elements is likely to be found in its natural state?
iron
sodium
aluminium
silver
Which element cannot be extracted from its ore by reduction with carbon?
iron
magnesium
copper
lead
Which of these elements would you expect to see just below carbon in the metal reactivity series?
lithium
aluminium
calcium
zinc
What state is needed for electrolysis of a metal compound?
molten (liquid)
solid
gaseous
any state will do
Why does the carbon anode need regular replacement in the electrolysis of aluminium oxide?
carbon is brittle and breaks down easily
it melts at the high temperatures
carbon reacts with the oxygen produced
it dissolves
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