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jayashimman from sboa, Chennai

Subject :NSO Class : Class 9

what is the meaning of permanent hardness of water

Ans 1:

Sarthak Praveen Modhe from St. Thomas Convent Sr. Sec. School, Bhopal

Class : Class 9

as hard water contains dissolved magnesium and calcium ions

Pulkit from Aryaman Vikram Birla- Institute of Learning, Haldwani

Class : Class 9

permanent hardness of water means it cannot be converted again into its soft state without strong boiling as it contains Ca and Mg salts..