Question

Which is incorrect for bleaching powder?
A.Bleaching powder is not highly soluble in water
B.Slightly yellow coloured powder
C.Oxidising agent
D.Reacts with dilute acid to release chlorine

Answer 1

Hint: Bleaching powder, a yellow coloured powder. It is used as a very good oxidizing agent, with chlorine acts as a bleaching agent.

Complete step by step solution:
Chlorine gas is used for the manufacturing of bleaching powder. Bleaching powder is produced by the action of chlorine on dry slaked lime \[{\text{Ca}}{\left( {{\text{OH}}} \right)_2}\] , that is overall reaction is:
\[2{\text{C}}{{\text{l}}_2}{\text{ }} + {\text{ }}2{\text{Ca}}{\left( {{\text{OH}}} \right)_2} \to {\text{Ca}}{\left( {{\text{ClO}}} \right)_2} + {\text{ CaC}}{{\text{l}}_2}{\text{ }} + {\text{ }}2{{\text{H}}_2}{\text{O}}\]
Bleaching powder is represented as \[{\text{Ca}}{\left( {{\text{ClO}}} \right)_2}\] that is calcium hypochlorite. Although Calcium hypochlorite is the main ingredient of bleaching powder, chloride powder or chlorinated lime It is not highly soluble in hard water (more preferable in soft to medium hard water), however we can say it is soluble in water. It is an oxidizing agent due to chlorine. It is strongly basic. It is white in colour (commercial as light yellow colour). Molar mass of calcium hypochlorite is 143 \[{\text{g}}/{\text{mol}}\] .
When bleaching powder reacts with dilute acid, all the chlorine present in it is liberated. This chlorine acts as the bleaching agent.
Bleaching powder is used for bleaching cotton, wood pulp, washed cloth, oxidizing agent in many industries, for disinfecting drinking water and swimming pools.
 As bleaching powder is soluble in water and also has the yellow colour. It behaves as a very good oxidizing agent. And with reaction of dilute acid with bleaching powder, chlorine is liberated which behaves as a bleaching agent.

Thus, the correct option is A.

Note:
Baking soda or sodium hydrogen carbonate \[\left( {{\text{NaHC}}{{\text{O}}_3}} \right)\] along with acid like tartaric acid is used to make baking powder which can be used for cooking and laboratory. Plaster of Paris is calcium sulphate hemihydrate \[\left( {{\text{CaS}}{{\text{O}}_4}. \dfrac{1}{2}{\text{H}}_2{\text{O}}} \right)\] formed by heating gypsum at 373K and losing of water molecules.