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Bleaching Powder

The amount of...

Question

The amount of chlorine obtained from a sample of bleaching powder by treatment with excess of dilute acid or $C O_{2}$ is called available chlorine.

A

True

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B

False

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Solution

The correct option is B False
The available chlorine is defined as the percentage of chlorine made available by bleaching powder when treated with dilute acids. The available chlorine present in bleaching powder sample is determined iodometricaliy by treating its solution with an excess of potassium iodide solution in the acidic medium.

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Q. Calculate the percentage of available chlorine in a given sample of bleaching powder from the following data.

3.55 g

of bleaching powder when treated with acetic acid and excess of

K I

liberated iodine which required

60 m L

0.5 N

sodium thiosulphate solution.

Q. In a given sample of bleaching powder, the percentage of available chlorine is 35. The volume of chlorine obtained if 10 g of the sample is treated with

H C l

1.25 g

of bleaching powder when treated with acetic acid and excess of

K I

, liberated iodine which required

37.5 m L

0.2 N

sodium thiosulphate solution. Calculate the percentage of available chlorine in the sample of bleaching powder.

Q. 5 g of a sample of bleaching powder is treated with excess acetic acid and KI solution. The liberated

I_{2}

required 50 ml of N/10 hypo solution. The % available chlorine in sample is

1.25 g

of bleaching powder when treated with acetic acid and excess of

K I

, liberated iodine which required

37.5 m L

0.2 N

sodium thiosulphate solution. Calculate the percentage of available chlorine in the sample of bleaching powder.

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