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Question

What volume of 0.40M−Na2S2O3 would be required to react with the I2 liberated by adding the excess KI to 50 mL of 0.20M−CuSO4

A
12.5 mL
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B
25 mL
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C
50 mL
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D
2.5 mL
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Solution

The correct option is B 25 mL
Given
Molarity of Na2S2O3 = 0.4M
Molarity of CuSO4 = 0.2M
Volume of CuSO4= 50mL
Solution
Using Volumetric principle

M1×V1=M2×V2
0.4×V1=0.2×50
V1=25ml
The correct option is B

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