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Q.

In an iodometric estimation, the following reactions occur2Cu2++4I−⟶Cu2I2+I2;I2+2Na2S2O3⟶2NaI+Na2S4O60.12 mole of CuSO4 was added to excess of KI solution and the liberated iodine required 120 mL of hypo. The molarity of hypo solution was:

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a

2

b

0.20

c

0.1

d

1.0

answer is D.

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Detailed Solution

Moles of pure CuSO4=0.12=0.12 moles of I2Na2S2O3 reacted with I2Moles of Na2S2O3 =120x10-3 x M = 0.12M =1.0
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In an iodometric estimation, the following reactions occur2Cu2++4I−⟶Cu2I2+I2;I2+2Na2S2O3⟶2NaI+Na2S4O60.12 mole of CuSO4 was added to excess of KI solution and the liberated iodine required 120 mL of hypo. The molarity of hypo solution was: