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The percentage of available chlorine in ...

The percentage of available chlorine in a commercial sampleof bleaching powder is

A

`52.9%`

B

`55.9%`

C

`58%`

D

`60%`

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The correct Answer is:
B
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Bleaching power is a mixed salt of hydrochloric acid and hypochlorious acid. It has the formula, CaOCI_(2).H_(2)O . It is manuafactured by the action of chlorine on dry slaked lime at 40^(@)C . There is also a view that bleaching power is a mixture [Ca(OCI)_(2)+CaCI_(2).Ca(OH)_(2).H_(2)O] . The amount of chlorine obtained form a sample of bleching power by the treatement with excess of dilute acids or CO_(2) is called a available chlorine. A good sample of bleaching power constains 35-38% of available chlorine. On long standing, it undergoes auto-oxidation and the amount of acvailable chlorine decreases. The estimation of available chlorine is done volumetrically by (a) iodometric method or by (b) aresenite method. In textile industry, the cotton cloth is mainly bleached with the help of bleaching power. The percentage of available chlorine in commercial samples of bleaching poweder is usually between 35% and 38% . The low value is due to

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Calculate the percentage of available chlorine in a sample of 3.55g of bleaching powder which was dissolved in 100mL of water. 25mL of this solution, on treatment with KI and dilute acid, required 20 mL of 0.125 N sodium thiosulphate solution.

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RESONANCE-EQUIVALENT CONCEPT & TITRATIONS-Exercise -1 (Part-II)
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  2. Equivalent weight of H(3)PO(4) in each of the reaction will be respect...

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  3. 3 g of an oxide of a metal is converted completely to 5 g chloride. Eq...

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  4. An ion is reduced to the element when it absords 6xx10^(20) electrons....

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  5. When N(2) is converted into NH(3), the equivalent weight of nitrogen w...

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  6. In the ionic equation 2K^(+)BrO(3)^(-)+12H^(+)+10e^(-)rarrBr(2)+6H(2)O...

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  7. If one mole of H(2)SO(4) reacts with one mole of NaOH, equivalent weig...

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  8. How many millilitres of 0.1 NH(2)SO(4) solution will be required for c...

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  9. One litre of a solution contains 18.9 g of HNO(3) and one litre of an...

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  10. If equal volumes of 0.1 M KMnO(4) and 0.1 M K(2)Cr(2)O(7) solutions ar...

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  11. Which of the following solutions will exactly oxidize 25mL of an acid ...

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  12. An element A in a compound ABD has oxidation number A^(n-). It is oxi...

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  13. The number of moles of oxalate ions oxidised by one mole of MnO(4)^(-)...

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  14. The percentage of available chlorine in a commercial sampleof bleachin...

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  15. A 0.2 g sample containing copper (II) was analysed iodometrically, whe...

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  16. A substance which participates readily in both acid-base and oxidation...

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  17. A fresh H(2)O(2) solution is labeled as 11.2 V. Calculate its concentr...

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  18. The amount of lime, Ca(OH)(2) required to remove the hardness in 60 L ...

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  19. What will the concentration of [Ca^(+2)] in a sample of 1 litre hard w...

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