Transition and InnerTransition Elements - Result Question 143
####43. $Fe^{3+}$ is reduced to $Fe^{2+}$ by using
(2015 Adv.)
(a) $H _2 O _2$ in presence of $NaOH$
(b) $Na _2 O _2$ in water
(c) $H _2 O _2$ in presence of $H _2 SO _4$
(d) $Na _2 O _2$ in presence of $H _2 SO _4$
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Answer:
Correct Answer: 43. $(a, b)$
Solution:
- $H _2 O _2$ is alkaline medium acts as reducing agent, reduces $Fe^{3+}$ to $Fe^{2+}$. In acidic medium the same $H _2 O _2$ oxidises $Fe^{2+}$ to $Fe^{3+}$.
