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    				| 1. | Unlike domestic sewage, waste water from industries like petrolium paper manufacturing metal extractions and processing etc. are often important source of water pollution out of these heavy metals are -A. Elements with density `lt 5 g//cm^(3)`B. Elements with density `lt 5 g//cm^(2)`C. Elements with density `gt 5g//cm^(3)`D. Elements with density `gt 5g//cm^(2)` | 
| Answer» Correct Answer - C | |