Four different metals are separately mixed with an equal volume of dilute hydrochloric acid.
The table shows the rate of effervescence for each metal.
What is the order of reactivity of the four metals starting with the most reactive?
1 )
iron → magnesium → calcium → copper
2 )
magnesium → calcium → copper → iron
3 )
copper → iron → magnesium → calcium
calcium → magnesium → iron → copper
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