add the following 3ab+bc-7ca,9ab+4bc-10ac and-6ab-3bc-2ac
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Iron metal is settling down at the bottom of the test tube. When ferrous sulphate is added to the iron-containing solution, then no change will be observed since metal is same, i.e. iron. So the green colour of FeSO4 disappears Fe metal is settling down at the bottom of the test tube. Hence the correct option is 4.
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