Chemistry Questions Asked in SSC CGL: Chemistry is an important part of the General Science section in competitive exams like SSC CGL, SSC CHSL, and Railway exams. Usually, around 4–5 questions are asked from this subject, and with a basic understanding, aspirants can score well. In this blog, we’ve included real exam-like Chemistry questions from previous SSC CGL exams to help you with your preparation.
Common Mistakes Aspirants Make in Chemistry Questions in SSC CGL Exam
Many SSC CGL aspirants lose marks in the Chemistry section due to small yet avoidable mistakes. Here’s what commonly goes wrong:
- Confusing similar-sounding chemical names (like Sodium carbonate vs. Sodium bicarbonate)
- Ignoring basic properties (like acidic vs. basic nature)
- Not revising formulas and common compounds regularly
- Guessing without proper logic, especially in questions based on common salt, acids, bases, or metals
- Skipping NCERT-level topics, assuming they’re too basic (but most questions are from these only)
Tips and Tricks to Solve Chemistry Questions in SSC CGL Exam
Chemistry in SSC CGL is mostly theory-based and fact-oriented. A few smart strategies can help you score better with less effort:
- Revise NCERTs from Class 6 to 10: Most questions are based on basic school-level concepts.
- Make short notes: Create flashcards or quick notes for chemical names, formulas, and common reactions.
- Remember common names and chemical names: Like baking soda (Sodium bicarbonate), common salt (Sodium chloride), etc.
- Focus on factual areas: Study acids, bases, salts, alloys, daily-use chemicals, fertilizers, and polymers.
- Use mnemonics: Make memory tricks for periodic table elements, common acids, and important metals.
- Don’t overcomplicate: Most questions are direct. Stick to the basic definitions and applications.
- Attempt mocks and previous year papers: You’ll know what kind of chemistry questions SSC actually asks.
- Revise chemical properties and their uses: For example, Hydrogen Peroxide in mouthwash, Caustic Potash as Potassium Hydroxide.
Important SSC CGL 2025 Chemistry Questions
Here are simple and important Chemistry questions for SSC CGL 2025. These are based on what is usually asked in real exams. All questions are short, easy to understand, and exam-focused.
Q1. The chemical formula of quicklime is:
(a) Ca(OH)₂
(b) CaCO₃
(c) CaO
(d) CaCl₂
Answer – (c)
Q2. Which gas is released when hydrochloric acid reacts with sodium bicarbonate?
(a) CO₂
(b) H₂
(c) O₂
(d) Cl₂
Answer – (a)
Q3. Which metal is stored in kerosene to prevent its reaction with air?
(a) Sodium
(b) Iron
(c) Calcium
(d) Zinc
Answer – (a)
Q4. Which one of the following is used as a common antiseptic in households?
(a) Sodium chloride
(b) Potassium iodide
(c) Iodine
(d) Sodium carbonate
Answer – (c)
Q5. Which acid is used in car batteries?
(a) Nitric acid
(b) Hydrochloric acid
(c) Sulphuric acid
(d) Acetic acid
Answer – (c)
Q6. The chemical formula of washing soda is:
(a) Na₂CO₃·10H₂O
(b) NaHCO₃
(c) NaCl
(d) NaOH
Answer – (a)
Q7. Which gas turns lime water milky?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen
Answer – (b)
Q8. What is the pH of a neutral solution?
(a) 0
(b) 5
(c) 7
(d) 10
Answer – (c)
Q9. Which among the following is used in the preservation of food?
(a) Sodium chloride
(b) Sodium benzoate
(c) Sodium hydroxide
(d) Sodium carbonate
Answer – (b)
Q10. Which one of the following is a noble gas?
(a) Nitrogen
(b) Oxygen
(c) Argon
(d) Hydrogen
Answer – (c)
Q11. The basic unit of a polymer is called:
(a) Monomer
(b) Atom
(c) Ion
(d) Molecule
Answer – (a)
Q12. Which vitamin is synthesized from cholesterol?
(a) Vitamin A
(b) Vitamin B
(c) Vitamin D
(d) Vitamin K
Answer – (c)
Q13. Which gas is used for artificial ripening of fruits?
(a) Oxygen
(b) Carbon dioxide
(c) Acetylene
(d) Nitrogen
Answer – (c)
Q14. Which acid is present in vinegar?
(a) Acetic acid
(b) Citric acid
(c) Oxalic acid
(d) Formic acid
Answer – (a)
Q15. Which of the following is used as a refrigerant in refrigerators?
(a) Ammonia
(b) Methane
(c) Carbon monoxide
(d) Ethylene
Answer – (a)
Q16. Which of the following is responsible for the depletion of the ozone layer?
(a) Carbon dioxide
(b) Chlorofluorocarbons
(c) Methane
(d) Sulphur dioxide
Answer – (b)
Q17. Which of the following is an example of a greenhouse gas?
(a) Hydrogen
(b) Carbon dioxide
(c) Nitrogen
(d) Argon
Answer – (b)
Q18. What is the chemical name of Plaster of Paris?
(a) Calcium carbonate
(b) Calcium sulphate hemihydrate
(c) Calcium sulphate dihydrate
(d) Calcium oxide
Answer – (b)
Q19. Which compound is added to LPG to detect leakage by smell?
(a) Methane
(b) Ethyl Mercaptan
(c) Ammonia
(d) Hydrogen sulphide
Answer – (b)
Q20. Which chemical is used to remove hardness of water in water purifiers?
(a) Sodium chloride
(b) Sodium carbonate
(c) Calcium carbonate
(d) Potassium nitrate
Answer – (b)
Q21. Which metal is used in making thermometers?
(a) Lead
(b) Mercury
(c) Zinc
(d) Iron
Answer – (b)
Q22. The rusting of iron is an example of:
(a) Physical change
(b) Chemical change
(c) Reversible change
(d) Displacement reaction
Answer – (b)
Q23. What is formed when an acid reacts with a base?
(a) Salt and water
(b) Hydrogen gas
(c) Oxygen gas
(d) Carbon dioxide
Answer – (a)
Q24. Which of the following is used in fire extinguishers?
(a) Nitrogen
(b) Hydrogen
(c) Carbon dioxide
(d) Oxygen
Answer – (c)
Q25. Bleaching powder is chemically known as:
(a) Sodium hypochlorite
(b) Calcium hypochlorite
(c) Calcium carbonate
(d) Calcium oxide
Answer – (b)
Q26. Which of the following is a synthetic indicator?
(a) Litmus
(b) Methyl orange
(c) Turmeric
(d) China rose
Answer – (b)
Q27. Which metal is used for galvanisation?
(a) Zinc
(b) Copper
(c) Silver
(d) Tin
Answer – (a)
Q28. Which compound is commonly used as a preservative in pickles?
(a) Sodium bicarbonate
(b) Citric acid
(c) Acetic acid
(d) Sodium nitrate
Answer – (c)
Q29. Which gas is known as laughing gas?
(a) Nitrous oxide
(b) Carbon monoxide
(c) Methane
(d) Hydrogen sulphide
Answer – (a)
Q30. The chemical name of bleaching powder is:
(a) Calcium carbonate
(b) Calcium oxychloride
(c) Sodium carbonate
(d) Sodium hydroxide
Answer – (b)
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Chemistry Questions for SSC CGL – FAQs
Ans. Around 4–5 Chemistry questions are asked in Tier 1.
Ans. Most questions are based on NCERT Class 6 to 10 concepts.
Ans. Focus on acids, bases, salts, metals, alloys, and common compounds.
Ans. NCERTs up to Class 10 and previous year question papers are most useful.
Ans. Revise short notes, attempt mocks, and focus on factual questions.
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