Bleaching Powder

Q.

What is the oxidation state of chlorine in calcium salt of Bleaching Powder $Ca(OCl{)}_2$?

1. -1
2. -2
3. 1
4. 

Q. Dry slaked lime on reaction with chlorine gives

1. Pure anhydrous Calcium chloride
2. Bleaching powder
3. A combination of , dibasic Calcium hypochlorite - and dibasic Calcium Chloride - .
4. Both (A) and (C)

Q. When chlorine is passed over dry slaked lime at room temperature, the main reaction product is

1. $Ca(Cl{O}_2{)}_2$
2. $CaC{l}_2$
3. $CaOC{l}_2$
4. $Ca(OCl{)}_2$

Q. Auto-oxidation of bleaching powder yields:

1. $Ca(Cl{O}_3{)}_2$
2. $CaC{l}_2$
3. $Ca(OCl{)}_2$
4. Both a and b

Q. Calculate the percentage of available chlorine in a sample of $3.546g$ of bleaching powder which was dissolved in $100mL$ of water, $25mL$ of this solution, when treated with acetic acid and excess $KI$ , required $20mLof0.125N$ sodium thiosulphate solution.

1. $15.01\%$
2. $0.1\%$
3. $10.01\%$
4. $20.02\%$

Q. $1.25g$ of bleaching powder when treated with acetic acid and excess of $KI$, liberated iodine which required $37.5mL$ of $0.2N$ sodium thiosulphate solution. Calculate the percentage of available chlorine in the sample of bleaching powder.

1. $30.0\%$
2. $21.3\%$
3. $12.5\%$
4. $9.7\%$

Q. Bleaching powder is obtained by

1. $CaO+C{l}_2$
2. $CaC{O}_3+C{l}_2$
3. $CaC{l}_2+C{l}_2$
4. $Ca(OH{)}_2+C{l}_2$

Q. 1.25 g sample of bleaching powder is dissolved in 100 mL of water and 25 mL of which is treated with $KI$ solution. The iodine so liberated required 12.5 mL of $\frac{N}{25}$ hypo solution. Find the percentage of chlorine available from the sample of bleaching powder

1. 5.68 %
2. 10.09 %
3. 15.31 %
4. 12.31 %

Q.

Write two uses of $Cl{O}_2$?

Q. Bleaching of flowers by $C{l}_2$ is permanent while bleaching by $S{O}_2$ is temporary. Why?