COMSATS Chemistry — Environmental Chemistry
Environmental Chemistry is part of the Chemistry section of the NTS NAT-IE test COMSATS admits on (10 of the 90 MCQs). It breaks into 1 subtopic, and we hold 9 NAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (1)
How Environmental Chemistry is tested
Across the 7 NAT-pattern papers on ParhaiKrlo, Environmental Chemistry accounts for 3 questions. It appears in 3 of them, about 1 questions a paper. The heaviest was COMSATS Past Paper 07, with 1 question.
| Paper | Questions |
|---|---|
| COMSATS Past Paper 07 | 1 |
| COMSATS Past Paper 04 | 1 |
| COMSATS Past Paper 01 | 1 |
Environmental Chemistry MCQs from the NAT-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · COMSATS Past Paper 07 · Environmental Chemistry
The main greenhouse gas released by burning fossil fuels is:
- A.nitrogen
- B.oxygen
- C.argon
- D.carbon dioxide
Show answer
Answer: D. carbon dioxide — Burning carbon-based fuels produces CO₂, which traps heat.
- Q2 · COMSATS Past Paper 04 · Environmental Chemistry
Acid rain is mainly caused by:
- A.oxides of sulphur and nitrogen
- B.chlorofluorocarbons
- C.methane
- D.ozone
Show answer
Answer: A. oxides of sulphur and nitrogen — SO₂ and NOₓ dissolve in rainwater to form sulphuric and nitric acids.
- Q3 · COMSATS Past Paper 01 · Environmental Chemistry
The ozone layer is mainly damaged by:
- A.water vapour
- B.carbon dioxide
- C.chlorofluorocarbons (CFCs)
- D.nitrogen gas
Show answer
Answer: C. chlorofluorocarbons (CFCs) — CFCs release chlorine atoms in the stratosphere, which break down ozone molecules.