General Knowledge :: Chemistry
- The water pollution in river is measured by the dissolved amount of
- Ultraviolet rays can be used in water treatment as
- Tar roads get damaged if there is
- The BOD values of water indicate the
- Iron and manganese present as pollutants in water cannot be removed by________
- Table salt gets moist during rainy season because
- When water itself combines chemically with some element or mineral it is called
- Sea water is saltier than rain water because
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