Đáp án đúng: D
Lượng H2SO4 cần dùng là 1,2 mol.
$\displaystyle \begin{array}{l}10FeS{{O}_{4}}~+\text{ }2KMn{{O}_{4}}~+\text{ }8{{H}_{2}}S{{O}_{4}}~\xrightarrow{{}}5F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}~+\text{ }2MnS{{O}_{4}}~+\text{ }{{K}_{2}}S{{O}_{4}}~+\text{ }8{{H}_{2}}O\\\,\,\,\,0,15\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0,03\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0,12\end{array}$
Dung dịch$\displaystyle KMn{{O}_{4}}$ màu tím (hồng)
Dung dịch$\displaystyle F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}$ màu vàng nâu