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JEE Mains 26-July-2022 Shift 2 Solved Paper
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© examsnet.com
Question : 63
Total: 90
Class XII students were asked to prepare one litre of buffer solution of
pH
8.26
by their Chemistry teacher: The amount of ammonium chloride to be dissolved by the student in
0.2
M
ammonia solution to make one litre of the buffer is
(Given:
pK
b
(
NH
3
)
=
4.74
Molar mass of
NH
3
=
17
g
mol
−
1
Molar mass of
NH
4
Cl
=
53.5
g
mol
−
1
)
[26-Jul-2022-Shift-2]
53.5
g
72.3
g
107.0
g
126.0
g
Validate
Solution:
For basic Buffer,
pOH
=
pK
b
+
log
[
salt
]
[
Base
]
pOH
=
14
−
8.26
=
5.74
5.74
=
4.74
+
log
[
NH
4
Cl
]
0.2
[
NH
4
Cl
]
=
2
M
Moles of
NH
4
Cl
=
2
×
1
=
2
moles
Weight of
NH
4
Cl
=
2
×
53.5
=
107
g
© examsnet.com
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