JEE Main 2014 · 6 Apr · Shift 1 · Chemistry Q49

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ChemistrySingle correct+4 / -1Question 49 of 90

Which series of reactions correctly represents chemical relations related to iron and its compound ?

\ce{Fe ->[dil H2SO4] FeSO4 ->[H2SO4, O2] Fe2(SO4)3 ->[heat] Fe}

\ce{Fe ->[O2, heat] FeO ->[dil H2SO4] FeSO4 ->[heat] Fe}

\ce{Fe ->[Cl2, heat] FeCl3 ->[heat, air] FeCl2 ->[Zn] Fe}

\ce{Fe ->[O2, heat] Fe3O4 ->[CO, 600^\circ C] FeO ->[CO, 700^\circ C] Fe}

Answer and worked solution

Official answer: D

In the blast furnace, iron oxides are reduced by CO in stages:
$\ce{Fe3O4 ->[CO, 600^\circ C] FeO ->[CO, 700^\circ C] Fe},$
and iron burns in $\ce{O2}$ to $\ce{Fe3O4}$ .

The others fail:

$\ce{Fe2(SO4)3}$ and $\ce{FeSO4}$ do not give Fe on heating;
$\ce{FeCl3}$ does not give $\ce{FeCl2}$ on heating in air.

Topics:Extraction of specific metals Transition element properties

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JEE Main 2014 · 6 Apr · Shift 1, Chemistry question 49