Question

$1 $ mole of equimolar mixture of $Fe _{2}\left( C _{2} O _{4}\right)_{3}$ and $FeC _{2} O _{4}$ requires $X$ moles of $KMnO _{4}$ in acid medium for complete reaciton. The value of $X$ is:

• A. 0.9
• B. 0.6
• C. 1.2
• D. 0.8

Answer 1

Answer: (A)

$Fe _{2} (C _{2} O _{4})_{3} \rightarrow 2 Fe ^{3+}+6 CO _{2}+6 \overline{ e }$ $n$ Factor $=6$
$FeC _{2} O _{4} \rightarrow Fe ^{3+}+2 CO _{2}+3 \overline{ e }$ n Factor $=3$
Meq s of $Fe_{2}\left( C _{2} O _{4}\right)_{3}+ Fe \left( C _{2} O _{4}\right)=0.5 \times 6+0.5 \times 3$
$=4.5$ Eqs.
$=4.5$ Eqs. of $KMnO _{4}$
$=\frac{4.5}{5}=0.9$ moles of $KMnO _{4}$