pBlock ElementsII 2 Question 3
3. Iodine reacts with concentrated $\mathrm{HNO}_{3}$ to yield $Y$ along with other products. The oxidation state of iodine in $Y$, is
(2019 Main, 12 Jan I)
(a) 1
(b) 3
(c) 7
(d) 5
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Solution:
- Iodine reacts with concentrated $\mathrm{HNO}{3}$ to yield $\mathrm{HIO}{3}$ along with $\mathrm{NO}{2}$ and $\mathrm{H}{2} \mathrm{O}$. The reaction involved in as follows :
$\mathrm{I}{2}+10 \mathrm{HNO}{3} \longrightarrow 2 \mathrm{HIO}{3}+10 \mathrm{NO}{2}+4 \mathrm{H}_{2} \mathrm{O}$
The oxidation state of ’ $\mathrm{I}$ ’ in $\mathrm{HIO}_{3}$ is +5 as calculated below :
$$ 1+x+3(-2)=0 $$
$x-5=0, x=+5$
