pBlock ElementsII - Result Question 132
####17. Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen? (2012)
(a) $HNO _3, NO, NH _4 Cl, N _2$
(b) $HNO _3, NO, N _2, NH _4 Cl$
(c) $HNO _3, NH _4 Cl, NO, N _2$
(d) $NO, HNO _3, NH _4 Cl, N _2$
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Solution:
- Let oxidation number of $N$ be $x$.
In $HNO _3,+1+x+3(-2)=0 \Rightarrow x=+5$
In NO, $\quad x-2=0 \Rightarrow x=+2$
In $N _2$,
$x=0$
In $NH _4 Cl, \quad x+4-1=0 \Rightarrow x=-3$
