Environmental Chemistry is a Class 11 Chemistry chapter that carries about 1.5% of the Chemistry questions in NEET. Practise it with 40 questions covering 3 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, Environmental Chemistry had 7 questions, about 0.5 a year. The most in one paper was 1, in AIPMT 2014.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 0 |
| NEET 2025 | 0 |
| NEET 2024 | 0 |
| NEET 2023 | 1 |
| NEET 2022 | 1 |
| NEET 2021 | 1 |
| NEET 2020 | 0 |
| NEET 2019 | 1 |
| NEET 2018 | 1 |
| NEET 2017 | 1 |
| NEET 2016 | 0 |
| Re-AIPMT 2015 | 0 |
| AIPMT 2014 | 1 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
The main primary pollutants that lead to photochemical smog are:
Answer: D. hydrocarbons and oxides of nitrogen
Why: Under sunlight these react to form ozone, PAN and aldehydes, the secondary pollutants of smog.
Hydrogen peroxide is called a green oxidant because:
Answer: B. its only by-product is water
Why: It is used for bleaching paper pulp and textiles instead of chlorine.
A high Biochemical Oxygen Demand (BOD) in a water sample indicates:
Answer: B. a large amount of biodegradable organic matter
Why: BOD measures the oxygen micro-organisms consume in degrading organic matter, so a high BOD means heavy organic pollution and little oxygen left for aquatic life.
Classical (London) smog differs from photochemical smog in that it:
Answer: A. is a reducing smog, containing smoke, fog and sulphur dioxide, and occurs in cool, humid climates
Why: Photochemical smog is an oxidising smog.
In dry cleaning, a green alternative to tetrachloroethene is:
Answer: C. liquefied carbon dioxide with a suitable detergent
Why: Liquid CO₂ is non-toxic and leaves no residue, avoiding the water contamination caused by chlorinated solvents.
Heavy algal growth in a lake that receives fertiliser run-off is mainly caused by:
Answer: D. an excess of nutrients such as phosphates and nitrates
Why: Excess nutrients cause algal blooms; when the algae die, their decomposition uses up dissolved oxygen and kills fish.
Which of the following is a greenhouse gas?
Answer: B. methane
Why: Methane, CO₂, N₂O, CFCs and water vapour absorb infrared radiation and warm the lower atmosphere.
In green chemistry, the percentage of the starting materials that ends up in the desired product is called:
Answer: B. atom economy
Why: A high atom economy means little waste.
Environmental Chemistry carries about 1.5% of the Chemistry questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 7 times, about 0.5 questions a year.
Environmental Chemistry is a Class 11 Chemistry chapter in the NCERT syllabus.
NeetVictory has 40 practice questions on Environmental Chemistry, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
NeetVictory