Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Volatile Organic compounds (VOCs) often are measured in the atmosphere as non-methane hydrocarbons.
Reason R : Methane is highly reactive in photochemical smog formation.
In the light of the above statements, choose the correct answer from the options given below:
A is true but R is false.
To determine the correct answer, we need to analyze both the Assertion A and Reason R.
Assertion A: "Volatile Organic Compounds (VOCs) often are measured in the atmosphere as non-methane hydrocarbons."
This statement is true. VOCs, which play a significant role in atmospheric chemistry, particularly in the formation of ozone and photochemical smog, are typically measured in terms of non-methane hydrocarbons (NMHCs). This is because methane (\text{CH}_4) is generally considered a separate category due to its abundance and distinct chemical properties, which influence different atmospheric processes compared to other VOCs.
Reason R: "Methane is highly reactive in photochemical smog formation."
This statement is false. Methane is relatively less reactive compared to many other VOCs when it comes to participating in reactions that lead to photochemical smog formation. Methane has a long atmospheric lifetime and does not contribute significantly to the reactive processes that form smog in urban areas. Instead, other non-methane VOCs are more reactive and impactful in forming smog.
Given the analysis:
- Assertion A is true as it correctly states that VOCs are often measured as non-methane hydrocarbons.
- Reason R is false because methane is not as reactive in forming photochemical smog compared to other VOCs.
Thus, the correct answer is: A is true but R is false.
Similar Questions
Give below are two statements:
Statement I : Thermal pollution, usually effluent from cooling systems of power plants or other industries, alters water temperature in a lake or stream.
Statement II : Humans also cause thermal pollution by altering vegetation cover and run-off patterns.
In the light of the above statements, choose the correct answer from the options given below:
Major contributor to carbon monoxide emissions in metropolitan areas of India is/are:
The most important pollutants that cause degradation of water quality in rivers and streams are
(a) Bacteria
(b) Nutrients
(c) Metals
(d) Total dissolved solids
(e) Algae
Choose the most appropriate answer from the options given below:The most dominant source of Benzene emissions in ambient air is
Major sources of oxygen demanding waste in fresh water systems are
(a) Agricultural run-off
(b) Food processing
(c) Ore mining
(d) Sewage effluent
(e) Landfill sites
Choose the correct option from those given below: -
Which of the following pollutant gases is not produced both naturally and as a result of industrial activity?
Which of the following pollutants is the major cause of respiratory diseases?
Assertion (A): In urban areas, smog episodes occur frequently in winters.
Reason (R): In winters, a lot of biomass is burnt by people for heating purposes or to keep themselves warm.
Choose the correct answer from the code given below:
With increase in temperature, the dissolved oxygen content in a water body will:
In the formation of Surface Ozone, which of the following do play an important role?
(a) Oxides of nitrogen
(b) Oxides of sulphur
(c) Sunlight
(d) Carbon monoxide
Choose the correct answer from the code given below:
Important Questions from Pollution
Which of the following isnota common component of photo-chemical smog?
Which of the following is NOT the main objective of Ganga action plan?
Which of the following pollutants causes water pollution ?
Presence of which pathogenic microbe in water is indication of contamination?
Which of the following isnota vehicular pollutant?
