Concept:
Bleaching Powder:
Calcium hypochlorite is commonly known as Bleaching powder.
Its formula is
Ca(ClO2) .
It is a pale yellow coloured powder with a strong smell of chlorine.
Uses of bleaching powder -
For bleaching dirty clothes in the laundry.
As a bleaching agent for cotton and linen in the textile industry also as a decolorizing agent for various designs .
As an oxidizer in many industries.
It is used as a disinfectant which is used for disinfecting water to make potable water.
Baking Soda:
It is commonly known as sodium bicarbonate.
Sodium bicarbonate is a white crystalline solid.
It can used as a neutralizer or antacid for quick relief in stomach acidity but only for temporary as it may be harmful.
It is used in baking products like cakes, cookies, etc.
Its formula is
NaHCO3 .
Washing Soda :
It is commonly known as
Na2CO3 or sodium carbonate.
It is used in the softening of hard water.
It is commonly used as a cleaning agent for domestic purposes.
It is also used in the manufacturing of glass, paper, soap, textiles, paints, etc.
Plaster of Paris:
Plaster of Paris (POP) , quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate) , which hardens when moistened and allowed to dry.
It is also known as the Plaster of Paris because for the preparation of POP, the abundant gypsum found near the capital city of France i.e. Paris .
The chemical formula of the Plaster of Paris is
CaSO4.H2O . Therefore option 3 is correct.
Application of Plaster of Paris is as follows It is used as a building material as a protective coating on walls and ceilings.
It is used as a moulding and vesting agent for decorative elements.
It is also used for aesthetic touch to the construction elements.
It is used to create toys as it can mould into different shapes.
It is also field as plaster in orthopaedics and as a filling material by dentists , etc.