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KCET 2015 Chemistry Solved Paper
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© examsnet.com
Question : 16
Total: 60
M
S
O
4
N
H
4
O
H
–
–
–
–
–
–
–
>
↓
X
white
N
H
4
O
H
–
–
–
–
–
–
–
–
–
>
excess
Y
H
2
S
–
–
–
–
–
–
–
>
↓
Z
Here M and Z are
C
u
,
Z
n
S
Z
n
,
Z
n
S
F
e
,
F
e
S
A
l
,
A
l
2
S
3
Validate
Solution:
The reaction involved is,
Z
n
S
O
4
NH
4
OH
–
–
–
–
–
–
–
–
>
Z
n
(
O
H
)
2
(
White
ppt
.
)
X
↓
NH
4
OH
–
–
–
–
–
–
–
–
>
Excess
[
Z
n
(
N
H
3
)
4
]
2
+
(
Clear
solution
)
Y
H
2
S
–
–
–
–
–
–
–
–
>
Z
n
S
↓
(
P
p
t
.
)
Z
Therefore, metal M is Zn and precipitate Z is ZnS.
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