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VITEEE 2013 Solved Paper
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© examsnet.com
Question : 73
Total: 120
A constant current of 3 0 A is passed through an aqueous solution of NaCl for a time of 1.00 h. What is the volume of
C
l
2
gas at STP produced?
30.00 L
25.08 L
12.54 L
1.12L
Validate
Solution:
Due to electrolysis
2
H
2
O
(l) +
2
e
−
→
H
2
(g) + 2
O
H
−
(aq)
2
C
l
−
(aq) →
C
l
2
(g) +
2
e
−
––––––––––––––––––––––––––––––––––––––––––
2
H
2
O
(l) +
2
C
l
−
(aq) →
H
2
(
g
)
+
C
l
2
(g) +
2
O
H
−
(aq)
––––––––––––––––––––––––––––––––––––––––––
O
H
−
formed = NaOH formed = Z i t
=
E
96500
× i × t
=
40
96500
× 30 × 1 × 60 × 60 = 44.77 g
=
44.77
4
= 1.12 mol
C
l
2
formed =
1
2
mol of NaOH
=
1.12
2
= 0.56 mol
= 0.56 × 22.4 L at STP = 12.54 L
© examsnet.com
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