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Q.

100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline copper sulphate to excess of KI. The value of ‘x’ is (molecular wt. of CuSO4.5H2O  is250)

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a

5.0 g

b

1.25 g

c

2.5 g

d

4 g

answer is C.

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Detailed Solution

 Cu+2SO41mole+2KIK2SO4+Cu+2I2;       2CuI2+2  CuI2+1+I2I2+Na2S2O31mole  2NaI  +Na2S4O6Eq.  wt.  of  CuSO4.5H2O =Mol.  wtchange in oxidation state of 'Cu'=2501=250100  ml  of  0.1  Nhypo  100  ml  of0.1  N  CuSO4.  5H2Omass of CuSO4.5H2O=N×E×V1000=250  ×  0.1×   1001000=2.5  g

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