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When iron is placed in blue copper sulphate solution, the solution turns green and reddish-brown copper is deposited. What is the best explanation?
AIron is less reactive than copper, so copper displaces iron
BIron displaces copper from copper sulphate because iron is more reactive
CCopper and iron combine to form an alloy
DThe reaction is a neutralization reaction
Answer & Solution
Correct answer: B. Iron displaces copper from copper sulphate because iron is more reactive
This is a displacement reaction. Iron is above copper in the activity series, so iron displaces copper from copper sulphate, forming iron(II) sulphate and copper metal. The green colour is due to iron(II) sulphate, while the reddish-brown deposit is copper.
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