MCQOPTIONS
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MCQOPTIONS
| 1. |
One degree of hardness of water means a content of salts of |
| A. | 10.25 mg/litre |
| B. | 12.25 mg/litre |
| C. | 14.25 mg/litre |
| D. | 16.25 mg/litre. |
| Answer» D. 16.25 mg/litre. | |