Environmental Chemistry Test - 8

Given, 10³ g (1 kg) sample contains oxygen

= 5 × 10^-3 gm

∴ 10⁶ gm sample will contain oxygen

= 5 ppm

Among the given chlorofluorocarbons are the compounds that are responsible for ozone depletion which degrades ozone into molecular oxygen. It is not a component of photochemical smog. while other given compounds are the main components of photochemical smog.

Photochemical smog is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles and ground-level ozone.

Being an irritant of the eyes, nose, throat and lungs, ozone is known to particularly affect asthmatics and people with respiratory problems.

The primary route of exposure to nitrogen oxides is by inhalation, but exposure by any route can cause systemic effects. Nitrogen oxides are irritating to the eyes, skin, nose, mucous membranes and respiratory tract.

Green chemistry involves such reactions which reduce the use and production of hazardous or toxic chemical to reduce pollution from the environment.

Micro-organisms present in the soil is a sink for CO

Nitrous oxide (N₂O) occurs naturally in the environment.

In an automobile engine, when fuel is burnt dinitrogen and dioxygen combine to yield NO and NO₂

Meso-sphere is the coldest region having about - 100^o C temperature.

Among all the given four options, option d is incorrect. It can be corrected as Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities. 

Green chemistry involves such reactions which reduce the use and production of hazardous or toxic chemical to reduce pollution from environment.

Ca(OCl)₂ or  calcium hypochlorite is the active ingredient in bleaching powder which releases chlorine.