During an experiment, iron nails are placed in copper sulphate solution, and a reddish-brown deposit forms on the nails. What does this observation demonstrate about the type of chemical reaction and the substances involved?
A displacement reaction occurs, forming copper metal on the iron nails
Iron is more reactive than copper, so it displaces copper from copper sulphate solution, forming a reddish-brown copper deposit on the nails.
This is a displacement reaction, not a double displacement, decomposition, or combination reaction, since one element replaces another in a compound.
Hence, 'A displacement reaction occurs, forming copper metal on the iron nails' is the correct answer.
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Copper sulphate crystals available in the market are blue coloured crystals. By careful heating, they turn to white colour. Which one of the following is responsible for the blue colour?
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