a) Single displacement reactions
b) Internal redox reaction
c) Simple redox reaction
d) Disproportionation reaction
e) None of these
Correct Answer:
b) Internal redox reaction.
Explanation:
When a decomposition reaction involves redox reactions; it is called asinternal redox reaction,
because the oxidized and reduced elements originate in the same compound. N in NH
4
+
is oxidized
from -3 to 0 and N in NO
2
-
is reduced from +3 to 0. Both redox reactions occur in the same
NH
4
NO
2
molecule.
Ex: NH
4
NO
2(s)
→N
2(g)
+ 2 H
2
O
(g)
In single displacement reactions, atom of one reactant replaces the atom of the other reactant.
Ex: a A + b BC→c AC + d B
In simple redox reaction,oxidation numbers of ionic reactants are changed by the direct transfer of
electrons from one ion to the other.
Ex: 2 Fe
3+
(aq)
+ Sn
2+
(aq)
→ 2 Fe
2+
(aq)
+ Sn
4+
(aq)
In a disproportionation reaction, the same species will simultaneously get oxidised and reduced to
form two different products.