MCQOPTIONS
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MCQOPTIONS
| 1. |
Hardness of water is conventionally expressed in terms of equivalent amount of |
| A. | H<sub>2</sub>CO<sub>3</sub> |
| B. | MgCO<sub>3</sub> |
| C. | CaCO<sub>3</sub> |
| D. | Na<sub>2</sub> CO<sub>3</sub> |
| Answer» D. Na<sub>2</sub> CO<sub>3</sub> | |