जॉइन Examsbookउत्तर : 1. "Calcium sulphate"
Permanent hardness of water is due to the presence of ?5
प्र: Permanent hardness of water is due to the presence of ?
- 1Calcium sulphatetrue
- 2Calcium bicarbonatefalse
- 3Sodium bicarbonatefalse
- 4Magnesium bicarbonatefalse
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उत्तर : 1. "Calcium sulphate"
व्याख्या :
Answer: A) Calcium sulphate Explanation:

