COD refers to
1.Chmical oxygen demand
2.Chemistry of diamonds
3.Catalysed oxidation of diamond
4.Catalysed oxidation of dussilved salts.
Earth is protected from U.V. radiations by
1.Carbon dioxide layer
2.Oxygen layer
3.Ozone layer
4.Troposphere.
Green chemistry refers to
1.Chemistry of plants
2.Chemistry of green pigments
3.Development of chemical products and processes less harmful to humans
4.Chemistry of geen house effect.
Oxides os sulphur and nitrogen ae important pollutants of
1.Water
2.Air
3.Soil
4.All the above
Spraying of DDT produces pollution of
1.Air
2.Air and water
3.Air and soil
4.Air water and soil.
Water pollution is mainly due to which of the following ?
1.Sulphur dioxide
2.Carbon dioxide
3.Oxygen
4.Industrial effluents
Which among the following is biodegradable pollutant?
1.Polythene
2.Asbestos
3.Sewage waste
4.Mercury
Which is most harmful for life on the globe ?
1.Deforestation
2.Soil erosion
3.Increasing deserts
4.Nuclear fallout.
Which is most harmful for life on the globe ? Increasing dese+A9rts
1.Deforestation
2.Soil erosion
3.Increasing dese+A9rts
4.Nuclear fallout.
Which of the following does not pertain to biosphere ?
1.Hydrosphere
2.Lithosphere
3.Thermosphere
4.Atmosphere
Which of the following does not pertain to biosphere ? .
1.Hydrosphere
2.Lithosphere
3.Thermosphere
4.Atmosphere
Which of the following is not a chemical pollutant ?
1.Solid waste
2.Noise
3.Insecticides
4.Liquid waste.
Which of the following is not a chemical pollutant ?
1.Solid waste
2.Noise
3.Insecticides
4.Liquid waste.
Which of the following substance is not present in acid rain ?
1.Sulphuric acid
2.Nitric acid
3.Sulphurous acid
4.Acetic acid
Which of the following substance is not present in acid rain ?
1.Sulphuric acid
2.Nitric acid
3.Sulphurous acid
4.Acetic acid