Chemistry - Study Mode

[#511] CNG used in automobiles to check pollution, mainly consists of
Correct Answer

(A) CH 4

Explanation

Solution: Nature gas is 95 percent Methane (CH 4 ) plus four other hydrocarbons: Ethane (C 2 H 6 ) - 2.5 %, Propane (C 3 H 8 ) - 0.2 %, Butane (C 4 H 10 ) - 0.06%, Pentanes Plus (C 5 H 12 + C 10 H 22 ) -0.02%. It also contains small amounts of: Nitrogen (N 2 ) - 1.6%, Carbon Dixoide (CO 2 ) - 0.7%, Hydrogen Sulphide (H 2 S) - trace, Water (H 2 O) - trace.

[#512] What are the major pollutants of cigarette smoke?
Correct Answer

(B) Carbon monoxide and nicotine

Explanation

Solution: Particulate matter consists of millions of tiny particles of diverse chemical composition. Particulate matter from tobacco smoke includes many particles in the size range that reflects light, which explains why tobacco smoke is easily seen by the eye. In contrast to smoke particles, gases emitted by the cigarette such as benzene and carbon monoxide (CO) are invisible to the eye. Particles smaller than 2.5 micrometers (PM2.5) are major components of cigarette smoke and can enter deep into the lung where they can cause serious health problems. The pollutants generated by the cigarette arise from the chemical process of burning organic matter, or combustion of tobacco and paper. Combustion processes, such as wood burning or waste incineration, emit thousands of pollutants, some of which are in the gas phase and some of which are in the form of small particles called particulate matter.

[#513] Which of the following metals is not a pollutant ?
Correct Answer

(D) Aluminium

Explanation

Solution: Aluminium is not a pollutant.

[#514] Main pollutant present in automobile exhaust is
Correct Answer

(A) CO

Explanation

Solution: Carbon monoxide is the main pollutant present in automobile exhaust.

[#515] The liquid waste from kitchens and baths, of residences is known as :
Correct Answer

(C) Sullage

Explanation

Solution: Sullage is all wastewater generated in households or office buildings from streams without fecal contamination, i.e. all streams except for the wastewater from toilets. Sources of sullage include, e.g. sinks, showers, baths, clothes washing machines or dish washers.