Question : Iron nails become ______ after being dipped in copper sulphate solution.
Option 1: bluish
Option 2: greenish
Option 3: greyish
Option 4: brownish
Correct Answer: brownish
Solution : The correct option is brownish.
After being dipped in copper sulfate solution, iron nails turn brownish because the reaction creates iron compounds like iron(III) oxide (rust). Copper ions can be released into the solution and iron compounds can be formed as a result of the reaction between iron and copper sulfate, which can displace copper.
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