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VITEEE 2019 Solved Paper
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© examsnet.com
Question : 72
Total: 125
In a hydrogen - oxygen fuel cell, combustion of hydrogen occurs to :
Produce high purity water
Create potential difference between the two electrodes
Generate heat
Remove adsorbed oxygen from electrode surfaces
Validate
Solution:
In hydrogen-oxygen fuel cell, following reactions take place to create potential difference between the two electrodes.
2
H
2
(
g
)
+
4
O
H
−
(
a
q
)
→
4
H
2
O
(
l
)
+
4
e
−
O
2
(
g
)
+
2
H
2
O
(
l
)
+
4
e
−
→
4
O
H
−
(
a
q
)
Overall reaction
=
2
H
2
(
g
)
+
O
2
(
g
)
→
2
H
2
O
(
l
)
the net reaction is the same as burning (combustion) of hydrogen to form water.
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