An iron nail is placed in a solution of copper sulphate. Which of the following changes will NOT occur?
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A.
The blue color of the solution fades.
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B.
Iron ions enter the solution.
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C.
The solution temperature increases significantly.
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D.
A brown layer forms on the iron nail.
Correct Answer:
C. The solution temperature increases significantly.
Explanation:
When an iron nail is immersed in a copper sulphate solution, a single displacement reaction occurs because iron is more reactive than copper. In this process, iron atoms from the nail displace copper ions from the solution, leading to the formation of iron(II) sulphate and solid copper. This reaction causes the characteristic blue color of the copper sulphate to fade as it is replaced by green iron(II) sulphate, and a reddish-brown coating of copper metal develops on the nail. While iron ions are released into the solution during this chemical change, the reaction does not produce a significant or noticeable increase in temperature. Therefore, the statement that the solution temperature increases significantly is the change that will not occur.
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