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When you place iron in copper sulphate solution, the reddish brown coating formed on the nail is:

(a) rough and granular (b) Hard and flaky (c) smooth and shining (d) soft and dull

I had it on my test for class XII.


Fe + cuso4 = feso4(rust) + cu
so,option b) is correct..!
but by applying lubricants like...paints,you can get rid of that.
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