pBlock ElementsII 1 Question 17
17. Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen? (2012)
(a) $\mathrm{HNO} _{3}, \mathrm{NO}, \mathrm{NH} _{4} \mathrm{Cl}, \mathrm{N} _{2}$
(b) $\mathrm{HNO} _{3}, \mathrm{NO}, \mathrm{N} _{2}, \mathrm{NH} _{4} \mathrm{Cl}$
(c) $\mathrm{HNO} _{3}, \mathrm{NH} _{4} \mathrm{Cl}, \mathrm{NO}, \mathrm{N} _{2}$
(d) $\mathrm{NO}, \mathrm{HNO} _{3}, \mathrm{NH} _{4} \mathrm{Cl}, \mathrm{N} _{2}$
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Answer:
Correct Answer: 17. (b)
Solution:
- Let oxidation number of $\mathrm{N}$ be $x$.
In $\mathrm{HNO} _{3},+1+x+3(-2)=0 \Rightarrow x=+5$
In NO, $\quad x-2=0 \Rightarrow x=+2$
In $\mathrm{N} _{2}$, $x=0$
In $\mathrm{NH} _{4} \mathrm{Cl}, \quad x+4-1=0 \Rightarrow x=-3$
