Chemistry Iron and manganese present as pollutants in water cannot be removed by________ Chlorination Oxidation followed by settling and filtration Lime soda process or manganese zeolite process Ion exchange process Chlorination Oxidation followed by settling and filtration Lime soda process or manganese zeolite process Ion exchange process ANSWER DOWNLOAD EXAMIANS APP
Chemistry Freon' used as refrigerants is chemically Fluorinated aromatic compound Fluorinated hydrocarbon Chlorinated hydrocarbon Chlorofluoro hydrocarbon Fluorinated aromatic compound Fluorinated hydrocarbon Chlorinated hydrocarbon Chlorofluoro hydrocarbon ANSWER DOWNLOAD EXAMIANS APP
Chemistry Ozone saves the biosphere by absorbing high energy radiations called ________ . Ultraviolet rays (UV) X–rays Gamma rays Infra-red (IR) Ultraviolet rays (UV) X–rays Gamma rays Infra-red (IR) ANSWER DOWNLOAD EXAMIANS APP
Chemistry Heavy metal pollution of water is caused by: Wood burning Acid Plants Domestic sewage Paints Wood burning Acid Plants Domestic sewage Paints ANSWER DOWNLOAD EXAMIANS APP
Chemistry Copper substances when exposed to air gains a green coating due to the formation of: CuCO3 Cu(OH)2 CuSO4 CuO Cu(NO3)2 CuCO3 Cu(OH)2 CuSO4 CuO Cu(NO3)2 ANSWER DOWNLOAD EXAMIANS APP
Chemistry Magnetite is Fe3O4 FeCO3 Fe2O3 2Fe2O3. 3H2O Fe3O4 FeCO3 Fe2O3 2Fe2O3. 3H2O ANSWER DOWNLOAD EXAMIANS APP
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