Some Basic Concepts of Chemistry - Result Question 20
####20. For the redox reaction
$$ MnO _4^{-}+C _2 O _4^{2-}+H^{+} \longrightarrow Mn^{2+}+CO _2+H _2 O $$
The correct coefficients of the reactants for the balanced reaction are
| $MnO _4^{-}$ | $C _2 O _4^{2-}$ | $H^{+}$ | |
|---|---|---|---|
| (a) | 2 | 5 | 16 |
| (b) | 16 | 5 | 2 |
| (c) | 5 | 16 | 2 |
| (d) | 2 | 16 | 5 |
(1992)
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Solution:
- From the given relative abundance, the average weight of $Fe$ can be calculated as
$$ A=\frac{54 \times 5+56 \times 90+57 \times 5}{100}=55.95 $$
