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One of the important use of ferrous sulphate is in the

$\begin{array}{1 1}(a)\;\text{Manufacture of blue black ink}\\(b)\;\text{Preparation of hydrogen sulphide}\\(c)\;\text{Manufacture of chalks}\\(d)\;\text{Preparation of anhydrous ferric chloride}\end{array}$

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One of the important use of ferrous sulphate is in the manufacture of blue black ink.
Hence (a) is the correct answer.
answered Jan 30, 2014 by sreemathi.v
 

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