MCQOPTIONS
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| 1. |
Which of the following causes the temporary hardness? |
| A. | CaSO<sub>4</sub> |
| B. | MgSO<sub>4</sub> |
| C. | MgCl<sub>2</sub> |
| D. | Ca (HCO<sub>3</sub>) <sub>2</sub> |
| Answer» E. | |