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Problems
(
X
)
(
Black
)
→
dil.
H
2
S
O
4
(
Y
)
(
gas
)
→
dil.
H
N
O
3
Colloidal sulphur
;
Identify
(
X
)
:
(X) (\text{Black}) \xrightarrow{\text{dil. } H_2SO_4} (Y) (\text{gas}) \xrightarrow{\text{dil. } HNO_3} \text{Colloidal sulphur}; \text{ Identify } (X):
(
X
)
(
Black
)
dil.
H
2
S
O
4
(
Y
)
(
gas
)
dil.
H
N
O
3
Colloidal sulphur
;
Identify
(
X
)
:
…
Chemistry
Problem
(
X
)
(
Black
)
→
dil.
H
2
S
O
4
(
Y
)
(
gas
)
→
dil.
H
N
O
3
Colloidal sulphur
;
Identify
(
X
)
:
(X) (\text{Black}) \xrightarrow{\text{dil. } H_2SO_4} (Y) (\text{gas}) \xrightarrow{\text{dil. } HNO_3} \text{Colloidal sulphur}; \text{ Identify } (X):
(
X
)
(
Black
)
dil.
H
2
S
O
4
(
Y
)
(
gas
)
dil.
H
N
O
3
Colloidal sulphur
;
Identify
(
X
)
:
a.
C
u
S
CuS
C
u
S
b.
F
e
S
FeS
F
e
S
c.
P
b
S
PbS
P
b
S
d.
N
i
S
NiS
N
i
S
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