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JEE Main 10 April 2015 Paper
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© examsnet.com
Question : 51
Total: 90
1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of M/10
H
2
S
O
4
solution.The excess sulphuric acid required 20 mL of M/10 NaOH solution for neutralization. The percentage of nitrogen in the compound is :
3
5
10
24
Validate
Solution:
Organic compound
→
N
H
3
(
1.4
g
)
2
N
H
3
+
H
2
S
O
4
→
(
N
H
4
)
2
S
O
4
H
2
S
O
4
+
2
N
a
O
H
→
N
a
2
S
O
4
+
2
H
2
O
n
N
H
3
+
20
×
1
10
×
1
1000
=
60
×
1
10
×
2
×
1
1000
n
N
H
3
=
12
1000
−
2
1000
=
10
100
n
N
=
n
N
H
3
=
0.01
⇒
m
N
=
0.01
×
14
=
0.14
g
⇒ % of N
=
0.14
1.4
×
100
=
10
%
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