Answer:
The degree of freedom of NH4CL is 1
Step-by-step explanation
The decomposition of
N
H
4
C
l
is
N
H
4
C
l
(
s
)
⇌
N
H
3
(
g
)
+
H
C
l
(
g
)
The system consists of two phases solid
N
H
4
C
l
and gaseous mixture of
N
H
3
a
n
d
H
C
l
. When
N
H
3
and HCl are present in same quantities the composition of both the phases can be represented by
N
H
4
C
l
.Hence, the system will be a one component system.
Therefore,
F
=
C
−
P
+
2
F
=
1
−
2
+
2
F=1