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KCET 2020 Chemistry Solved Paper
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© examsnet.com
Question : 6
Total: 60
How many moles of
K
2
C
r
2
O
7
is required to liberate 6 moles of
I
2
from an aqueous solution of
I
−
?
0.25
0.5
2
1
Validate
Solution:
The balanced redox reaction will be:
𝐾
2
𝐶
𝑟
2
𝑂
7
+
6
𝐾
𝐼
+
7
𝐻
2
𝑆
𝑂
4
→
4
𝐾
2
𝑆
𝑂
4
+
3
𝐼
2
+
𝐶
𝑟
2
(
𝑆
𝑂
4
)
3
+
7
𝐻
2
O
3 moles of
𝐼
2
requires 1 mole of
𝐾
2
𝐶
𝑟
2
𝑂
7
Hence, 6 moles of
𝐼
2
will require 2 moles of
𝐾
2
𝐶
𝑟
2
𝑂
7
© examsnet.com
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