UPPSC Chemistry — Previous Year Questions

This page has 21 solved questions on Chemistry across 7 papers (2019–2025). Every one is solved below — open a question for the answer, why it is right, and why each wrong option was written to tempt you.

UPPSC's published Prelims syllabus does not name this as a separate head. These questions come under Paper I head 7 — "General Science".

1. 2025Q5With reference to 'Baking Soda', which of the following statements is/are correct ? 1. It is Sodium hydrogen carbonate. 2. It is used in fire extinguishers. Select the correct answer from the code given below :Answer: B
2. 2025Q59Which of the following pairs is/are NOT correctly matched ? (Acid) - (Acid found in) 1. Lactic acid - Curd 2. Tartaric acid - Grapes 3. Acetic acid - Potato Select the correct answer from the code given below :Answer: C
3. 2025Q75With reference to 'Silver articles', which of the following statements is/are correct ? 1. Silver articles turn black after some time when exposed to air. 2. It happens due to coating of silver sulphide. Select the correct answer from the code given below : Code :Answer: B
4. 2025Q78With reference to 'acid and bases', which of the following statements is/are correct ? 1. Acidic solutions have pH more than 7. 2. Basic solutions have pH less than 7. Select the correct answer from the code given below : Code :Answer: C
5. 2024Q65Milk is an example of :Answer: D
6. 2024Q66The formula of baking soda is :Answer: D
7. 2023Q79Which of the following elements is not a Noble gas?Answer: D
8. 2023Q100Which of the following is known as laughing gas?Answer: C
9. 2022Q54Thermodynamically the most stable form of carbon isAnswer: D
10. 2022Q92Which among the following compounds is the main constituent of natural gas ?Answer: B
11. 2022Q104Compressed Natural Gas (CNG) is mainly composed ofAnswer: C
12. 2022Q113Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R). Assertion (A) : A solution of table salt in a glass of water is homogeneous. Reason (R) : A solution having different composition throughout is homogeneous. Select the correct answer from the code given below : Code :Answer: A
13. 2022Q130Which one of the following pair is NOT correctly matched ?Answer: B
14. 2021Q86Which of the following is NOT correctly matched?Answer: C
15. 2021Q88Which one of the following is the main constituent of LPG?Answer: C
16. 2020Q93Which of the following polymer is NOT a thermoplastic ?Answer: B
17. 2020Q111Match List-I with List-II and select the correct answer from the codes given below the lists: List-I (Substance) A. Blue Vitriol B. Eosin C. Silver iodide D. Zinc phosphide List-II (Use) 1. Artificial rain 2. Fungicide 3. Red ink 4. RodenticideAnswer: C
18. 2019Q13Which of the following pairs is NOT correctly matched ?Answer: D
19. 2019Q17Which one of the following materials contains calcium ?Answer: C
20. 2019Q18Which one of the following is NOT correctly matched ? (Substance) — (Use)Answer: A
21. 2019Q88Match List - I with List - II and select the correct answer from the codes given below the lists : List - I A. Kevlar B. Taxol C. Zinc Phosphide D. Nitrocellulose List - II 1. Explosive 2. Synthetic fibre 3. Anticancer drug 4. Rodenticide Codes :Answer: B