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RRB Group-D Model Paper 20 with answers for online practice
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© examsnet.com
Question : 54
Total: 100
Chemical name of washing soda is:
Sodium chloride
Sodium hydrogen carbonate
Sodium carbonate
Sodium hydroxide
Validate
Solution:
Washing soda is a chemical compound with the formula
N
a
2
C
O
3
, known as sodium carbonate, and it's a salt of carbonic acid.
Properties of a Washing soda:
It is a transparent crystalline solid.
It is one of the few metal carbonates which are soluble in water.
It is alkaline with a pH level of 11, it turns red litmus to blue.
It has detergent properties or cleansing properties because it can remove dirt and grease from dirty clothes, etc.
It attacks dirt and grease to form water-soluble products, which are then washed away on rinsing with water.
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