MCQOPTIONS
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MCQOPTIONS
| 1. |
What indicates the permanent hardness when alum is added to water? |
| A. | Al (OH)<sub>3</sub> |
| B. | CaSO<sub>4</sub> |
| C. | CO<sub>2</sub> |
| D. | Ca (OH)<sub>3</sub> |
| Answer» C. CO<sub>2</sub> | |