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Question

2.5 g sample of copper is dissolved in excess of H2SO4 to prepare 100 ml of 0.02MCuSO4(aq). 10 ml of 0.02M solution of CuSO4(aq) is mixed with excess of KI to show the following changes:

CuSO4+2KIK2SO4+CuI2

2CuI2Cu2I2+I2

The liberated iodine is titrated with hypo (Na2S2O3) which requires V ml of 0.1M hypo solution for its complete reduction.
The volume (V) of hypo required is:

A
2 ml
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B
20 ml
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C
1 ml
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D
10 ml
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Solution

The correct option is B 2 ml
100 mL of 0.02 M CuSO4 solution corresponds to 100×0.02=2 mmol.
Out of this, 10 mL (i.e 0.2 mmol) are used for the titration.
I2+2Na2S2O3Na2S4O6+2I
2CuSO42CuI2I22Na2S2O3
The volume of hypo required is 0.20.1=2 ml.

Hence, the correct option is (A).

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