Question

Out of the following redox reactions
I. $N{H}_{4}N{O}_3\stackrel{\Delta }{\to }{N}_{2}O+2H_{2}O$
II. $N{H}_{4}N{O}_2\stackrel{\Delta }{\to }{N}_2+2H_{2}O$
III. $PC{l}_5\stackrel{\Delta }{\to }PC{l}_3+C{l}_2$
disproportionation is not shown in

• A. I and II
• B. II and III
• C. I and III
• D. I, II and III

Answer 1

Answer: (D)

I. $\underset{-3}{N{H}_4^{+}}\underset{+5}{N{O}_3^{-}}⟶\underset{+1}{N_{2}O}+2H_{2}O$
It is $a$ redox reaction but not $a$ disproportionation reaction. Since, different N-species are involved.
II. ${\underset{-3}{N{H}_4}}^{+}{\underset{+3}{N{O}_2}}^{-}⟶\underset{0}{N_2}$
same as (I)
III.$\underset{+5-1}{PC{l}_5}⟶\underset{+3-1}{PC{l}_3}+\underset{0}{C{l}_2}$
Thus, it is also not a disproportionation reaction.