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標題:

A ce Chemistry mc q

發問:

An iron rail is heted with concentrated sulphuric acid . Which of the following combination is correct?A.hydrogen given off;pale green soluion formedB.hydrogen given off;yellow soluion formedC.sulphur dioxide given off;pale green soluion formedD.sulphur dioxide given off;yellow soluion formedPlease answer... 顯示更多 An iron rail is heted with concentrated sulphuric acid . Which of the following combination is correct? A.hydrogen given off;pale green soluion formed B.hydrogen given off;yellow soluion formed C.sulphur dioxide given off;pale green soluion formed D.sulphur dioxide given off;yellow soluion formed Please answer with a Chemical equation as an explanation.

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最佳解答:

Answer should be D Reaction between conc. sulphuric acid and iron metal will release sulphur dioxide gas and iron(III) sulphate. 2Fe(s) + 6H2SO4(l) ------〉Fe2(SO4)3(aq) + 3SO2(g) + 2H2O(l) Iron(III) ion is yellow so the ans is D

其他解答:

應該係c 因為conc. h2so4 同Fe 會行 redox reaction sulphate ions will be reduced to sulphur dioxide and Fe will be oxidized to Fe2+ ions (green colour). 至於點解唔係oxidized to Fe3+ 就要 你上a level 先會解到la. 個人意見only!~thx