The oxide of Sulphur (Sulphur Dioxide) is washed down on earth as acid rain. It makes the soil acidic by lowering its pH; this affects plants and animals adversely. Acid rain contains H⁺, SO₄^2- ions which when added to the soil leaches the nutrients from the soil. Acid rain renders the river or even ocean water acidic, thereby affecting marine animals adversely. Changes in pH of fresh water affect the reproduction and survival or many species or fish.

Correct Option: C

The oxide of Sulphur (Sulphur Dioxide) is washed down on earth as acid rain. It makes the soil acidic by lowering its pH; this affects plants and animals adversely. Acid rain contains H⁺, SO₄^2- ions which when added to the soil leaches the nutrients from the soil. Acid rain renders the river or even ocean water acidic, thereby affecting marine animals adversely. Changes in pH of fresh water affect the reproduction and survival or many species or fish.

The chemical composition of Heavy water (deuterium oxide) is 2H₂O or D₂O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.

Correct Option: D

The chemical composition of Heavy water (deuterium oxide) is 2H₂O or D₂O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.

Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, and propane. Its manufacture has been phased out under the Montreal Protocol.

Correct Option: A

Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, and propane. Its manufacture has been phased out under the Montreal Protocol.

Acid rain is caused by emissions of Sulfur Dioxide (SO₂) and Nitrogen Oxide (NO_x), which react with the water molecules in the atmosphere to produce acids. Emissions of SO₂ and NO_x result from fossil fuel combustion. The chemicals in acid rain can cause paint to peel, corrosion of steel structures such as bridges, and erosion of stone statues.

Correct Option: B

Acid rain is caused by emissions of Sulfur Dioxide (SO₂) and Nitrogen Oxide (NO_x), which react with the water molecules in the atmosphere to produce acids. Emissions of SO₂ and NO_x result from fossil fuel combustion. The chemicals in acid rain can cause paint to peel, corrosion of steel structures such as bridges, and erosion of stone statues.

Nitrous oxide (N₂O) and methane (CH₄) are the two major greenhouse gasses (GHG) emitted by agricultural activities. N₂O accounts for around 8% of the warming impact of current human GHG emissions. Agricultural activities that directly increase N₂O emissions are: fertilization, application of manure or other organic materials, retention of crop residues, production of nitrogen-fixing crops and forages, and cultivation of soils with high organic matter content. Irrigation, drainage, tillage practices and fallowing of land also increase N₂O emission.

Correct Option: A

Nitrous oxide (N₂O) and methane (CH₄) are the two major greenhouse gasses (GHG) emitted by agricultural activities. N₂O accounts for around 8% of the warming impact of current human GHG emissions. Agricultural activities that directly increase N₂O emissions are: fertilization, application of manure or other organic materials, retention of crop residues, production of nitrogen-fixing crops and forages, and cultivation of soils with high organic matter content. Irrigation, drainage, tillage practices and fallowing of land also increase N₂O emission.