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Q.

2.35g of bleaching powder were with acetic acid and excess of KI solution ‘x’ is added. The liberated iodine was titrated with 60mL of N10 hypo solution using starch as indicator. Calculate the percentage of available chlorine in the sample of bleaching powder. Given(CaOCl2+2CH3COOHCa(CH3COO)2+H2O+Cl2  2KI+Cl22KCl+I2) (rounding to nearest integer)

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answer is 9.

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Detailed Solution

6m  moles  of  hypo=3 m.  moles  of  I2=3m.  Moles  ofCl2

i.e.  0.213  gm  Cl2, %Cl20.2132.35×100=9.06

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