[300+] Important Chemistry GK Question for Students (2026)

Chemistry GK Question help us understand the world around us, and they make tough ideas feel simple. When I started learning, I realized how many everyday things are connected to chemistry, from the food we eat to the air we breathe. In this article, you will find all types of Chemistry GK Question Answer in Hindi, Chemistry GK Question Answer, and Chemistry GK Question in English that make studying fun and easy.

Whether you are looking for Class 11th Chemistry GK Question, GK Question Related to Chemistry, or even Some GK Question of Chemistry, this guide has it all. Students of different grades will also find useful sets like Chemistry GK Questions for Class 9, Chemistry GK, Questions in Tamil, Chemistry GK Questions Class 10, and Chemistry GK Questions PDF. Stay with me, and by the end, you will feel more confident and ready to tackle any chemistry quiz or exam.

Chemistry GK Question

What is the atomic number of Hydrogen?
It is 1.

Which gas is known as laughing gas?
Nitrous oxide.

What is the chemical formula of water?
H₂O.

Which element is the hardest natural substance?
Diamond.

Which acid is found in lemon?
Citric acid.

What is the common name of NaCl?
Table salt.

Which metal is liquid at room temperature?
Mercury.

What is the pH value of pure water?
It is 7.

Which gas is essential for burning?
Oxygen.

Which element is used in pencils?
Graphite.

What is the chemical symbol for Gold?
Au.

Which vitamin is also called Ascorbic Acid?
Vitamin C.

Which gas is filled in balloons?
Helium.

What is the main component of natural gas?
Methane.

Which acid is called King of Chemicals?
Sulfuric acid.

What is the SI unit of temperature?
Kelvin.

Which element is used for disinfecting water?
Chlorine.

Which metal is most reactive?
Potassium.

What is the chemical formula of ozone?
O₃.

Which gas causes the greenhouse effect mainly?
Carbon dioxide.

Chemistry GK Question Answer in Hindi

प्रश्न (Q)	उत्तर (A)
हाइड्रोजन का परमाणु क्रमांक क्या है?	1
नींद गैस किसे कहा जाता है?	नाइट्रस ऑक्साइड
जल का रासायनिक सूत्र क्या है?	H₂O
नींबू में कौन सा अम्ल पाया जाता है?	साइट्रिक एसिड
पेंसिल में किस तत्व का उपयोग होता है?	ग्रेफाइट
गोल्ड का रासायनिक चिन्ह क्या है?	Au
कौन-सी धातु कमरे के तापमान पर द्रव होती है?	पारा
शुद्ध जल का pH मान कितना होता है?	7
बल्ब में कौन-सी गैस भरी जाती है?	आर्गन
किस गैस से पौधे भोजन बनाते हैं?	कार्बन डाइऑक्साइड
प्राकृतिक गैस का मुख्य घटक क्या है?	मीथेन
दूध में पाया जाने वाला प्रमुख प्रोटीन कौन सा है?	कैसीन
ओजोन का सूत्र क्या है?	O₃
किस अम्ल को रसायनों का राजा कहा जाता है?	सल्फ्यूरिक एसिड
रक्त का लाल रंग किससे बनता है?	हीमोग्लोबिन

Chemistry GK Question Answer

Q1. Which gas is known as the “universal solvent”?
Water vapor dissolves many substances.

Q2. What is the main component of air?
Nitrogen.

Q3. Which element is known as quicksilver?
Mercury.

Q4. Which acid is present in vinegar?
Acetic acid.

Q5. What is the lightest metal?
Lithium.

Q6. Which gas is used in fire extinguishers?
Carbon dioxide.

Q7. What is the chemical symbol of Iron?
Fe.

Q8. Which metal is used to make electrical wires?
Copper.

Q9. What is the purest form of carbon?
Diamond.

Q10. Which gas turns lime water milky?
Carbon dioxide.

Q11. Which element is necessary for hemoglobin formation?
Iron.

Q12. What is the formula of common salt?
NaCl.

Q13. Which gas is used for welding?
Acetylene mixed with oxygen.

Chemistry GK Question In English

Q1. What is the lightest known element?
Hydrogen.

Q2. Which element is used in fluorescent lamps?
Mercury.

Q3. What is the chemical name of baking soda?
Sodium bicarbonate.

Q4. Which gas has the lowest density?
Hydrogen.

Q5. What is the main ore of aluminum?
Bauxite.

Q6. Which acid is used in car batteries?
Sulfuric acid.

Q7. What is the chemical formula of limewater?
Ca(OH)₂.

Q8. Which element is stored under kerosene?
Sodium.

Q9. What is the common name of calcium carbonate?
Limestone.

Q10. Which metal is used to make coins?
Nickel.

Q11. What is the freezing point of water?
0°C.

Q12. Which gas is used in soda water?
Carbon dioxide.

Q13. What is the chemical symbol for lead?
Pb.

Q14. Which metal is essential for plant growth?
Magnesium.

Q15. What is the pH of acidic solutions?
Less than 7.

Q16. Which element is used in matchsticks?
Phosphorus.

Q17. What is the formula of ethanol?
C₂H₅OH.

Q18. Which gas is known as marsh gas?
Methane.

Q19. What is alloy of tin and lead called?
Solder.

Q20. Which compound is called quicklime?
Calcium oxide.

Q21. Which metal is used for aircraft bodies?
Aluminum.

Chemistry GK Questions for Class 9

Q1. What is an atom?
The smallest unit of an element.

Q2. What is the formula of carbon dioxide?
CO₂.

Q3. Which acid is used in pickles?
Acetic acid.

Q4. What is the atomic number of oxygen?
8.

Q5. What is a molecule?
A group of two or more atoms.

Q6. Which gas is used for respiration?
Oxygen.

Q7. What is the symbol of potassium?
K.

Q8. Which metal is used in thermometers?
Mercury.

Q9. What is the boiling point of water?
100°C.

Q10. What is an isotope?
Atoms of the same element with different mass numbers.

Q11. What is the formula of ammonia?
NH₃.

Q12. What is a chemical change?
A change that forms a new substance.

Q13. Which gas is used for photosynthesis?
Carbon dioxide.

Q14. What is a base?
A substance with pH above 7.

Q15. Which metal is a good conductor?
Copper.

Q16. What is rusting?
Iron reacting with oxygen and moisture.

Q17. What is the symbol of sodium?
Na.

Q18. What is the formula of methane?
CH₄.

Q19. Which element is non-metal but conducts electricity?
Graphite.

Q20. What is the SI unit of volume?
Cubic meter.

Q21. What is a valence electron?
Electron in the outermost shell.

Chemistry GK Questions Class 10

Q1. What is neutralization?
Reaction between acid and base.

Q2. What is the salt formed from HCl and NaOH?
Sodium chloride.

Q3. What is thermal decomposition?
Breaking down due to heat.

Q4. Which gas turns moist red litmus blue?
Ammonia.

Q5. What is electrolysis?
Chemical breakdown using electricity.

Q6. What is the reactivity series?
Arrangement of metals by reactivity.

Q7. What is bleaching powder?
Calcium oxychloride.

Q8. What is the formula for washing soda?
Na₂CO₃·10H₂O.

Q9. Which metal is extracted from hematite?
Iron.

Q10. What is the pH of blood?
Around 7.4.

Q11. Which gas is produced during respiration?
Carbon dioxide.

Q12. What is galvanization?
Coating iron with zinc.

Q13. Which metal reacts violently with water?
Potassium.

Q14. What is the chemical name of chalk?
Calcium carbonate.

Q15. What is a strong acid?
An acid that ionizes completely.

Q16. What is a catalyst?
A substance that speeds up reactions.

Q17. Which gas is responsible for acid rain?
Sulfur dioxide.

Q18. What is the symbol of silver?
Ag.

Q19. What is displacement reaction?
A more reactive metal replaces a less reactive one.

Q20. What is the formula of plaster of Paris?
CaSO₄·½H₂O.

Q21. What is saponification?
Soap formation process.

Class 11th Chemistry GK Question

Qs	Ans
What is Avogadro’s number?	6.022 × 10²³
What is the SI unit of amount of substance?	Mole
What is an ionic bond?	Bond by electron transfer
What is a covalent bond?	Bond by electron sharing
What is hybridization?	Mixing of atomic orbitals
What is the octet rule?	Atoms aim for 8 electrons
What is electronegativity?	Tendency to attract electrons
What is electron affinity?	Energy released when electron is added
What is ionization enthalpy?	Energy required to remove an electron
What is the ideal gas equation?	PV = nRT
What is the universal gas constant (R)?	8.314 J/mol·K
What is a sigma bond?	Direct overlap bond
What is a pi bond?	Sideways overlap bond
What is limiting reagent?	Reactant consumed first
What is a redox reaction?	Oxidation + reduction
What is molarity?	Moles per liter of solution
What is molality?	Moles per kg of solvent
What is a buffer solution?	Maintains constant pH
What is enthalpy?	Heat content of a system
What is Hess’s law?	Total enthalpy change is constant
What is resonance?	Delocalization of electrons
What is the Aufbau principle?	Electrons fill lowest energy orbitals first
What is a quantum number?	Values describing electron state

GK Question Related to Chemistry

Q1. Which gas is produced in fermentation?
Carbon dioxide.

Q2. What is the common name of sodium hydroxide?
Caustic soda.

Q3. Which element is essential for bones?
Calcium.

Q4. What is dry ice?
Solid carbon dioxide.

Q5. Which metal is used in making mirrors?
Silver.

Q6. What is the formula of hydrogen peroxide?
H₂O₂.

Q7. What is the lightest gas?
Hydrogen.

Q8. Which gas is used in refrigerators?
Freon.

Q9. What is chromatography?
Separation method.

Q10. What is the chemical name of sugar?
Sucrose.

Q11. Which chemical is used for water purification?
Chlorine.

Q12. What is an emulsifier?
Substance that mixes oil and water.

Q13. What is the main component of LPG?
Propane and butane.

Q14. What is the formula for benzene?
C₆H₆.

Q15. Which element is used in light bulbs?
Tungsten.

Q16. What is distillation?
Purification by boiling and condensation.

Q17. Which ion causes hardness in water?
Calcium or magnesium.

Q18. What is a polymer?
Large molecule made of repeating units.

Q19. What is Teflon made of?
Polytetrafluoroethylene.

Q20. What is the formula of nitric acid?
HNO₃.

Q21. What is the source of natural rubber?
Latex.

Some GK Question of Chemistry

Q1. What is displacement of water method?
Gas collection technique.

Q2. Which element is used in explosives?
Nitrogen compounds.

Q3. What is aqua regia?
Mixture of HCl and HNO₃.

Q4. Which gas is known as sewer gas?
Methane.

Q5. What is sublimation?
Solid to gas directly.

Q6. Which metal forms protective oxide layer?
Aluminum.

Q7. What is lanthanide series?
Elements 57–71.

Q8. What is an alloy of copper and tin?
Bronze.

Q9. Which gas is used for anesthesia?
Nitrous oxide.

Q10. What is molecular mass?
Sum of atomic masses.

Q11. Which element is used in water heaters?
Nichrome.

Q12. What is fermentation?
Sugar breakdown by microbes.

Q13. Which chemical causes tear irritation?
Chlorine gas.

Q14. What is the formula of gypsum?
CaSO₄·2H₂O.

Q15. What is nylon made from?
Polyamide.

Q16. What is blue vitriol?
Copper sulfate.

Q17. What is bleaching?
Color removal by oxidation.

Q18. Which metal gives green flame?
Barium.

Q19. Which element is used in CRT screens?
Phosphors.

Q20. What is the heaviest noble gas?
Radon.

Q21. What is the chemical name of milk of magnesia?
Magnesium hydroxide.

Chemistry GK Questions in Tamil

Qs	Ans
அணு எண் என்றால் என்ன?	ஒரு தனிமத்தின் புரோட்டான் எண்ணிக்கை
வாத்தின் முக்கிய உறுப்பு எது?	நைட்ரஜன்
காரங்களில் pH மதிப்பு எவ்வளவு?	7-க்கு மேல்
எதிலின் வாய்ப்பாடு என்ன?	C₂H₄
பனிக்கட்டி உருகும் புள்ளி?	0°C
தங்கம் எந்த குழுவில் உள்ளது?	11வது குழு
பாக்டீரியாவை அழிக்க பயன்படுத்தப்படும் வேதிப் பொருள்?	குளோரின்
கார்பன் டெட்‌ராகுளோரைடின் வாய்ப்பாடு என்ன?	CCl₄
எந்த உலோகம் மிக இலகுவானது?	லித்தியம்
இரும்பு எதனால் எளிதில் சிதைக்கும்?	ஆக்சிஜன் + ஈரப்பதம்
எரிவாயுவில் முக்கியமான சேர்மம்?	மீத்தேன்
சோப்பு தயாரிக்கும் செயல்முறை என்ன?	சப்போனிபிகேஷன்
எந்த உலோகம் சத்துணவில் அவசியம்?	இரும்பு
பேக்கிங் பவுடரில் உள்ள முக்கிய சேர்மம்?	சோடியம் பைகார்போனேட்
வினையின் வேகத்தை அதிகரிப்பது யார்?	உத்தேசகம் (Catalyst)
அமிலத்தின் pH மதிப்பு?	7-க்கு குறைவு
மின்காந்த அலைகளில் குறைந்த அலைநீளம் எதற்குண்டு?	காம்மா கதிர்கள்
ஆக்சைடு என்றால்?	ஆக்சிஜன் சேர்ந்த சேர்மம்
கண்ணாடி தயாரிக்க பயன்படுத்துவது?	சிலிகா
பாரா எந்த நிலையிலும் தங்கி இருக்கும்?	த்ரவநிலை (Room temperature)
குளுக்கோஸின் வாய்ப்பாடு?	C₆H₁₂O₆
குளிர் பெட்டியில் பயன்படுத்தப்படும் வாயு?	ஃப்ரீயான் (CFC)

Chemistry GK Questions PDF

Q1. What is the formula of hydrochloric acid?
HCl.

Q2. Which element is used in flashlights?
Magnesium.

Q3. What is the natural source of iodine?
Seaweed.

Q4. What is the formula of sulfur dioxide?
SO₂.

Q5. Which gas is known as bleaching agent?
Chlorine.

Q6. What is the pH of lemon juice?
Around 2–3.

Q7. Which metal does not corrode?
Gold.

Q8. What is the formula of glucose?
C₆H₁₂O₆.

Q9. Which gas is used in water treatment?
Ozone.

Q10. What is the main component of glass?
Silica.

Q11. What is fusion?
Solid to liquid change.

Q12. Which metal burns with a bright white flame?
Magnesium.

Q13. What is the chemical name of table sugar?
Sucrose.

Q14. Which gas is called inert gas?
Helium.

Q15. What is desalination?
Removing salt from seawater.

Q16. Which compound is used in fertilizers?
Ammonium nitrate.

Q17. What is the formula of nitric oxide?
NO.

Q18. Which element is used in semiconductors?
Silicon.

Q19. What is an indicator?
Shows acid/base nature.

Q20. What is the formula of zinc oxide?
ZnO.

Q21. Which gas supports combustion?
Oxygen.

conclusion:

In conclusion, I hope these Chemistry GK Question sets helped you understand basic concepts and connected them to real life. By studying Chemistry GK Question Answer in Hindi, Chemistry GK Question Answer, and Chemistry GK Question in English, you can now remember important facts more easily. These simple questions are perfect for practice, quick revision, and improving your confidence in chemistry.

I also hope that students exploring Class 11th Chemistry GK Question, GK Question Related to Chemistry, or Some GK Question of Chemistry found this guide useful. If you are a learner checking Chemistry GK Questions for Class 9, Chemistry GK Questions in Tamil, Chemistry GK Questions Class 10, or Chemistry GK Questions PDF, keep practicing regularly. Remember, the more you revise, the easier exams and quizzes will feel. Keep learning, and don’t stop exploring new facts in chemistry!

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