Answer / Abhinaya Bhullar

Hard scale is formed by impurities such as calcium, magnesium, and iron oxides. Soft scale is primarily caused by dissolved salts like sodium, chloride, and sulfates.

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Hai, i am going to appear for Section Engineer- Mechanical,RRB Chennai.Can anybody please post me the previous question papers and solutions to ajeshsudhakaran@gmail.com....

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send me tech quesions please to 470.rajesh@gmail.com

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