1) Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen? 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) $NO,HNO_{3},NH_{4}Cl,N_{2}$ Answer: Option BExplanation:Let oxidation number of "N" be x In $HNO_{3}$+1+x+3(-2)=0 $\Rightarrow$ x=+5 In $NO$ x-2=0 $\Rightarrow$x=+2 in $N_{2}$ x=0 In $NH_{4}Cl$ x+4-1=0$\Rightarrow$ x=-3
