MCQOPTIONS
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MCQOPTIONS
| 1. |
When alum is added to the waste water containing calcium ions which compound is formed as a precipitate?$ |
| A. | Al(OH)<sub>3</sub> |
| B. | Al<sub>2</sub> (SO<sub>4</sub>)<sub>3</sub> |
| C. | Ca(OH)<sub>2</sub> |
| D. | CaCO<sub>3</sub> |
| Answer» B. Al<sub>2</sub> (SO<sub>4</sub>)<sub>3</sub> | |