Redox Reactions And Electrochemistry Ques 676
Question: Among $ NH_3,HNO_3,NaN_3 $ and $ Mg_3N_2 $ the number of molecules having nitrogen in negative oxidation state is
Options:
A) 1
B) 2
C) 3
D) 4
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Calculating the oxidation state of nitrogen in given molecules; Oxidation state of N in $ NH_3 $ is $ x+3\times (+1)=0, or ,x=-3 $
Oxidation state on N in $ HNO_3 $ is $ 1+x+3\times ( -2 )=0,or,x=+5 $
Oxidation state of N in $ NaN_3 $ is $ +1+3x=0or,x=-\frac{1}{3} $
Oxidation state of N in $ Mg_3N_2 $ is $ 3\times 2+2x=0,or,x=-3 $
Thus 3 molecules (i.e. $ NH_3,NaN_3 $ and $ Mg_3N_2 $ have nitrogen in negative oxidation states.
