100 Chemistry GK Questions

100 Chemistry GK Questions

100 Chemistry GK MCQs

🔹 Scientists & Discoveries (1–15)

  1. Who is known as the father of modern chemistry?
    A) Newton
    B) Lavoisier
    C) Dalton
    D) Rutherford
    Answer: B
  2. Who discovered the periodic table?
    A) Mendeleev
    B) Bohr
    C) Rutherford
    D) Curie
    Answer: A
  3. Who discovered oxygen?
    A) Priestley
    B) Cavendish
    C) Dalton
    D) Einstein
    Answer: A
  4. Who discovered hydrogen?
    A) Boyle
    B) Cavendish
    C) Rutherford
    D) Lavoisier
    Answer: B
  5. Who proposed atomic theory?
    A) Dalton
    B) Bohr
    C) Rutherford
    D) Thomson
    Answer: A
  6. Who discovered electron?
    A) Bohr
    B) Thomson
    C) Rutherford
    D) Chadwick
    Answer: B
  7. Who discovered neutron?
    A) Chadwick
    B) Thomson
    C) Rutherford
    D) Bohr
    Answer: A
  8. Who discovered proton?
    A) Goldstein
    B) Rutherford
    C) Dalton
    D) Einstein
    Answer: B
  9. Who invented dynamite?
    A) Nobel
    B) Edison
    C) Curie
    D) Pasteur
    Answer: A
  10. Who discovered radium?
    A) Marie Curie
    B) Newton
    C) Dalton
    D) Bohr
    Answer: A
  11. Who discovered radioactivity?
    A) Becquerel
    B) Curie
    C) Rutherford
    D) Thomson
    Answer: A
  12. Who is known as father of chemistry?
    A) Boyle
    B) Lavoisier
    C) Dalton
    D) Rutherford
    Answer: B
  13. Who discovered penicillin?
    A) Fleming
    B) Pasteur
    C) Koch
    D) Darwin
    Answer: A
  14. Who developed planetary atomic model?
    A) Bohr
    B) Dalton
    C) Thomson
    D) Rutherford
    Answer: A
  15. Who proposed modern periodic law?
    A) Mendeleev
    B) Moseley
    C) Bohr
    D) Dalton
    Answer: B

🔹 Elements & Symbols (16–30)

  1. Symbol of gold?
    A) Ag
    B) Au
    C) Gd
    D) Go
    Answer: B
  2. Symbol of silver?
    A) Si
    B) Ag
    C) Sr
    D) Sv
    Answer: B
  3. Symbol of iron?
    A) Ir
    B) Fe
    C) In
    D) I
    Answer: B
  4. Symbol of sodium?
    A) So
    B) Sd
    C) Na
    D) N
    Answer: C
  5. Symbol of potassium?
    A) Pt
    B) Po
    C) K
    D) P
    Answer: C
  6. Symbol of mercury?
    A) Hg
    B) Me
    C) Mc
    D) Hr
    Answer: A
  7. Symbol of copper?
    A) Cp
    B) Cu
    C) Co
    D) Cr
    Answer: B
  8. Symbol of zinc?
    A) Zn
    B) Zc
    C) Zm
    D) Zi
    Answer: A
  9. Symbol of helium?
    A) He
    B) Hl
    C) Hm
    D) Ho
    Answer: A
  10. Symbol of oxygen?
    A) Ox
    B) O
    C) Oy
    D) On
    Answer: B
  11. Symbol of nitrogen?
    A) Ni
    B) N
    C) Nt
    D) Ne
    Answer: B
  12. Symbol of carbon?
    A) Ca
    B) C
    C) Cr
    D) Co
    Answer: B
  13. Symbol of chlorine?
    A) Cl
    B) Ch
    C) Cn
    D) Ce
    Answer: A
  14. Symbol of calcium?
    A) Ca
    B) Cl
    C) Cm
    D) Co
    Answer: A
  15. Symbol of lead?
    A) Pd
    B) Pb
    C) Ld
    D) La
    Answer: B

🔹 Important Gases & Uses (31–50)

  1. Gas used in balloons?
    A) Oxygen
    B) Hydrogen
    C) Nitrogen
    D) CO₂
    Answer: B
  2. Gas used in fire extinguisher?
    A) Oxygen
    B) CO₂
    C) Hydrogen
    D) Methane
    Answer: B
  3. Gas causing global warming?
    A) Oxygen
    B) CO₂
    C) Nitrogen
    D) Helium
    Answer: B
  4. Gas causing acid rain?
    A) SO₂
    B) O₂
    C) N₂
    D) H₂
    Answer: A
  5. Gas supporting combustion?
    A) Oxygen
    B) Nitrogen
    C) CO₂
    D) Helium
    Answer: A
  6. Most abundant gas in air?
    A) Oxygen
    B) Nitrogen
    C) CO₂
    D) Hydrogen
    Answer: B
  7. Gas used in refrigerators?
    A) Freon
    B) Oxygen
    C) Hydrogen
    D) Neon
    Answer: A
  8. Laughing gas?
    A) NO
    B) N₂O
    C) CO₂
    D) O₂
    Answer: B
  9. Gas turns lime water milky?
    A) Oxygen
    B) CO₂
    C) Nitrogen
    D) Hydrogen
    Answer: B
  10. Gas used in welding?
    A) Oxygen
    B) Nitrogen
    C) Helium
    D) Argon
    Answer: D

🔹 Acids & Bases (41–60)

  1. Acid in lemon?
    A) Acetic acid
    B) Citric acid
    C) Lactic acid
    D) Tartaric acid
    Answer: B
  2. Acid in vinegar?
    A) Citric acid
    B) Acetic acid
    C) Sulfuric acid
    D) Nitric acid
    Answer: B
  3. Acid in stomach?
    A) HCl
    B) H₂SO₄
    C) HNO₃
    D) CH₃COOH
    Answer: A
  4. pH of pure water?
    A) 5
    B) 7
    C) 9
    D) 3
    Answer: B
  5. Baking soda is?
    A) Na₂CO₃
    B) NaHCO₃
    C) KCl
    D) CaCO₃
    Answer: B
  6. Washing soda is?
    A) Na₂CO₃
    B) NaCl
    C) K₂CO₃
    D) CaO
    Answer: A
  7. Common salt is?
    A) NaCl
    B) KCl
    C) CaCl₂
    D) MgCl₂
    Answer: A
  8. Antacid used for?
    A) Fever
    B) Acidity
    C) Infection
    D) Pain
    Answer: B
  9. Gas released by acid + metal?
    A) Oxygen
    B) Hydrogen
    C) CO₂
    D) Nitrogen
    Answer: B
  10. Indicator turning red in acid?
    A) Litmus
    B) Phenolphthalein
    C) Starch
    D) Water
    Answer: A

Metals & Non-Metals (51–70)

  1. Which metal is liquid at room temperature?
    A) Iron
    B) Mercury
    C) Zinc
    D) Copper
    Answer: B
  2. Best conductor of electricity?
    A) Silver
    B) Iron
    C) Lead
    D) Aluminium
    Answer: A
  3. Metal used in thermometers?
    A) Iron
    B) Mercury
    C) Copper
    D) Gold
    Answer: B
  4. Metal used in electric wires?
    A) Lead
    B) Aluminium
    C) Silver
    D) Zinc
    Answer: B
  5. Metal used in aircraft?
    A) Iron
    B) Aluminium
    C) Copper
    D) Tin
    Answer: B
  6. Metal used in jewellery?
    A) Iron
    B) Silver
    C) Zinc
    D) Magnesium
    Answer: B
  7. Metal used in batteries?
    A) Lithium
    B) Gold
    C) Iron
    D) Copper
    Answer: A
  8. Most reactive metal?
    A) Gold
    B) Potassium
    C) Silver
    D) Copper
    Answer: B
  9. Least reactive metal?
    A) Sodium
    B) Gold
    C) Potassium
    D) Calcium
    Answer: B
  10. Non-metal used in pencils?
    A) Sulphur
    B) Carbon
    C) Phosphorus
    D) Chlorine
    Answer: B
  11. Non-metal used in matches?
    A) Sulphur
    B) Oxygen
    C) Nitrogen
    D) Neon
    Answer: A
  12. Essential non-metal for life?
    A) Iron
    B) Oxygen
    C) Gold
    D) Copper
    Answer: B
  13. Non-metal used in fertilizers?
    A) Nitrogen
    B) Oxygen
    C) Neon
    D) Helium
    Answer: A
  14. Water purification element?
    A) Chlorine
    B) Iron
    C) Sodium
    D) Calcium
    Answer: A
  15. Hardest natural substance?
    A) Gold
    B) Diamond
    C) Silver
    D) Iron
    Answer: B
  16. Gas used in neon lights?
    A) Neon
    B) Oxygen
    C) Hydrogen
    D) Nitrogen
    Answer: A
  17. Gas used in weather balloons?
    A) Hydrogen
    B) Oxygen
    C) Nitrogen
    D) Carbon dioxide
    Answer: A
  18. Metal used in coins?
    A) Iron
    B) Copper
    C) Aluminium
    D) Zinc
    Answer: B
  19. Metal used in construction (buildings)?
    A) Gold
    B) Iron
    C) Helium
    D) Neon
    Answer: B
  20. Metal used in stainless steel?
    A) Chromium
    B) Neon
    C) Helium
    D) Argon
    Answer: A

🔹 Organic Chemistry & Compounds (71–85)

  1. Main component of LPG?
    A) Methane
    B) Propane
    C) Oxygen
    D) Nitrogen
    Answer: B
  2. Main component of CNG?
    A) Methane
    B) Ethane
    C) Butane
    D) Oxygen
    Answer: A
  3. Petroleum is a mixture of?
    A) Metals
    B) Hydrocarbons
    C) Salts
    D) Acids
    Answer: B
  4. Alcohol used in beverages?
    A) Methanol
    B) Ethanol
    C) Propanol
    D) Butanol
    Answer: B
  5. Methanol is also called?
    A) Wood alcohol
    B) Sugar alcohol
    C) Oil alcohol
    D) Acid alcohol
    Answer: A
  6. Glucose is a type of?
    A) Protein
    B) Carbohydrate
    C) Fat
    D) Mineral
    Answer: B
  7. Plastic is made from?
    A) Polymers
    B) Metals
    C) Salts
    D) Water
    Answer: A
  8. Rubber is obtained from?
    A) Petroleum
    B) Latex
    C) Coal
    D) Iron
    Answer: B
  9. Protein is made of?
    A) Amino acids
    B) Fatty acids
    C) Glucose
    D) Minerals
    Answer: A
  10. Urea is mainly used as?
    A) Fertilizer
    B) Fuel
    C) Acid
    D) Salt
    Answer: A
  11. Aspirin is used as?
    A) Fertilizer
    B) Medicine
    C) Fuel
    D) Salt
    Answer: B
  12. Vinegar contains?
    A) Acetic acid
    B) Citric acid
    C) Nitric acid
    D) Sulfuric acid
    Answer: A
  13. Detergents are used for?
    A) Cleaning
    B) Cooking
    C) Burning
    D) Cooling
    Answer: A
  14. Cellulose is found in?
    A) Animals
    B) Plants
    C) Metals
    D) Water
    Answer: B
  15. Fermentation produces?
    A) Oxygen
    B) Alcohol
    C) Nitrogen
    D) Salt
    Answer: B

🔹 Chemical Reactions & Facts (86–100)

  1. Rusting of iron is?
    A) Oxidation
    B) Reduction
    C) Evaporation
    D) Filtration
    Answer: A
  2. Loss of electrons is called?
    A) Oxidation
    B) Reduction
    C) Neutralization
    D) Distillation
    Answer: A
  3. Gain of electrons is called?
    A) Oxidation
    B) Reduction
    C) Sublimation
    D) Filtration
    Answer: B
  4. Substance that speeds reaction?
    A) Catalyst
    B) Salt
    C) Acid
    D) Base
    Answer: A
  5. Mixture of metals is called?
    A) Alloy
    B) Solution
    C) Compound
    D) Gas
    Answer: A
  6. Steel is mainly made of?
    A) Iron + Carbon
    B) Copper + Zinc
    C) Gold + Silver
    D) Aluminium + Oxygen
    Answer: A
  7. Bronze is made of?
    A) Copper + Tin
    B) Iron + Carbon
    C) Zinc + Lead
    D) Silver + Gold
    Answer: A
  8. Brass is made of?
    A) Copper + Zinc
    B) Iron + Nickel
    C) Gold + Copper
    D) Aluminium + Iron
    Answer: A
  9. Photosynthesis produces?
    A) Oxygen
    B) Nitrogen
    C) Hydrogen
    D) Carbon monoxide
    Answer: A
  10. Respiration produces?
    A) Oxygen
    B) Carbon dioxide
    C) Nitrogen
    D) Helium
    Answer: B
  11. Exothermic reaction releases?
    A) Heat
    B) Cold
    C) Light only
    D) Sound only
    Answer: A
  12. Endothermic reaction absorbs?
    A) Heat
    B) Oxygen
    C) Water
    D) Salt
    Answer: A
  13. Atomic number represents?
    A) Protons
    B) Neutrons
    C) Electrons + neutrons
    D) Molecules
    Answer: A
  14. Atomic mass is sum of?
    A) Protons + Neutrons
    B) Electrons only
    C) Protons only
    D) Neutrons only
    Answer: A
  15. Periodic table is arrangement of?
    A) Elements
    B) Compounds
    C) Mixtures
    D) Solutions
    Answer: A