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प्रश्न
The name of the salt used to remove permanent hardness of water is ______.
विकल्प
Sodium hydrogen carbonate (NaHCO3)
Sodium chloride (NaCl)
Sodium carbonate decahydrate (Na2CO3.10H2O)
Calcium sulphate hemihydrate (CaSO4.`1/2`H2O)
उत्तर
The name of the salt used to remove permanent hardness of water is Sodium carbonate decahydrate (Na2CO3.10H2O).
Explanation:
Insoluble carbonates are created when washing soda reacts with the salts in water and are easily removed through physical means.
APPEARS IN
संबंधित प्रश्न
Name the sodium compound which is used for softening hard water.
What is the common name of (a) NaHCO3 and (b) Na2CO3.10H2O?
Fill in the following blank:
Chemical formula of washing soda is ..................
What is washing soda?
State whether an aqueous solution of washing soda is acidic or alkaline? Give reason for your answer.
What is meant by saying that washing soda has detergent properties?
How many molecules of water of crystallisation (per formula unit) are present in:
washing soda?
Answer the following question.
How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water that can be removed by it?
Correct the mistakes:
- Washing soda is used for making cakes and bread soft, spongy.
- Calcium sulphate hemihydrate is used in textile industry for bleaching cloths.
Na2CO3.10H2O is ____________.
