Out of different oxides of nitrogen which of the following are considered as Air Pollutants and known as NOX?

A. NO (Nitric Oxide)

B. NO2 (Nitrogen dioxide)

C. NO3 (Nitrogen trioxide)

D. N2O (Nitrous oxide)

Choose the correct answer from the options given below.

This question was previously asked in
UGC NET Paper 1: Held on 22nd Feb 2023 Shift 2
View all UGC NET Papers >
  1. A and B Only
  2. B and C Only
  3. C and D Only
  4. A, B and D Only

Answer (Detailed Solution Below)

Option 1 : A and B Only
Free
UGC NET Paper 1: Held on 21st August 2024 Shift 1
10.8 K Users
50 Questions 100 Marks 60 Mins

Detailed Solution

Download Solution PDF
Key Points 

NO (nitric oxide) and NO2 (nitrogen dioxide) are the two main oxides of nitrogen that are considered as air pollutants

NO and NO2:

  • NO and NO2 are formed when fuel is burned at high temperatures.
  • NO is a reddish-brown gas that is a major component of smog.
  • NO2 is a brown gas that is a major component of acid rain.
  • Both NO and NO2 can irritate the lungs and cause respiratory problems.

The main sources of NO and NO2 emissions are:

  • Power plants
  • Vehicles
  • Industrial processes
  • Construction sites
  • Wood burning

NO and NO2 can be reduced by using cleaner fuels, installing pollution control devices, and reducing emissions from vehicles.

Here are some of the harmful effects of NOx air pollutants:

  • Respiratory problems: 
    • NOx can irritate the lungs and cause respiratory problems like asthma, bronchitis, and pneumonia.
  • Heart disease: 
    • NOx can increase the risk of heart disease by increasing inflammation and narrowing the arteries.
  • Cancer: 
    • NOx can increase the risk of cancer by damaging DNA.
  • Smog:
    •  NOx is a major component of smog, which can cause respiratory problems, heart disease, and cancer.
  • Acid rain: 
    • NOx can react with atmospheric water vapour to form nitric acid, which can fall to Earth as acid rain. Acid rain can damage trees, lakes, and other ecosystems.

 

Hence, The correct answer is 1) A and B Only.

Latest UGC NET Updates

Last updated on Jun 11, 2025

-> The UGC NET Exam Schedule 2025 for June has been released on its official website.

-> Check UPSC Prelims Result 2025, UPSC IFS Result 2025, UPSC Prelims Cutoff 2025, UPSC Prelims Result 2025 Name Wise & Rollno. Wise

-> The UGC NET Application Correction Window 2025 is available from 14th May to 15th May 2025.

-> The UGC NET 2025 online application form submission closed on 12th May 2025.

-> The June 2025 Exam will be conducted from 21st June to 30th June 2025

-> The UGC-NET exam takes place for 85 subjects, to determine the eligibility for 'Junior Research Fellowship’ and ‘Assistant Professor’ posts, as well as for PhD. admissions.

-> The exam is conducted bi-annually - in June and December cycles.

-> The exam comprises two papers - Paper I and Paper II. Paper I consists of 50 questions and Paper II consists of 100 questions. 

-> The candidates who are preparing for the exam can check the UGC NET Previous Year Papers and UGC NET Test Series to boost their preparations.

More Pollution Questions

More Environmental Issues Questions

Get Free Access Now
Hot Links: teen patti master downloadable content teen patti gold online lucky teen patti teen patti casino teen patti all