Environmental Chemistry Test - 42

Photochemical smog is basically a mixture of bad chemicals. It consist of nitrogen oxides, ozone, volatile organic compounds and PAN. It is caused by air pollution.
Option B is correct.

Conversion of oxygen to ozone is a non spontaneous process. Hence, it will not take place at any temperature.

The Bhopal disaster or Bhopal gas tragedy was an industrial accident. It happened at a Union Carbide subsidiary pesticide plant in the city of Bhopal, India. On 3 December 1984, the plant released 42 tons of toxic methyl isocyanate (MIC) gas, exposing more than 500,000 people to toxic gases.

Answer is option D i.e. "Consume too much of water"
Excessive use of fertilizers and pesticides by farmers in agriculture to enhance crop yield is detrimental to environment and human health. Fertilizers and pesticides use has led to the problem of air, water and soil pollution. Excessive chemicals in the soil low the level of water holding capacity there by causing low moisture content on soil for plant use. Hence, they consume much water.

Rain can carry and deposit the nitrogen in some pollutants on rivers and soils. This will adversely affect the nutrients in the soil and water bodies. This can result in algae growth in lakes and water bodies, and make conditions for other living organism harmful.this is called eutrophication.

Compost is organic matter that has been decomposed and recycled as a fertilizer and soil amendment. Compost is a key ingredient in organic farming. At the simplest level, the process of composting requires making a heap of wetted organic matter known as green waste (leaves, food waste) and waiting for the materials to break down into humus after a period of weeks or months. 

Deep injection is a liquid waste disposal technology. This alternative uses injection wells to place treated or untreated liquid waste into geologic formations that have no potential to allow migration of contaminants into potential potable water aquifers.

Other methods result into pollution and are not a feasible solution. 

A sedimentation tank allows suspended particles to settle out of water or wastewater as it flows slowly through the tank, thereby providing some degree of purification. A layer of accumulated solids, called sludge, forms at the bottom of the tank and is periodically removed.