Basic Chemistry Mcqs With Answers Pdf Read Chemistry MCQS Free
- Which of the following elements is a noble gas?
a) Sodium
b) Chlorine
c) Helium
d) Iron
Answer: c) Helium
2. What is the chemical symbol for gold?
a) Go
b) Ag
c) Au
d) Agl
Answer: c) Au
3. Which of the following is a primary greenhouse gas responsible for global warming?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: b) Carbon dioxide
4. What is the chemical formula for water?
a) H2O2
b) CO2
c) H2O
d) O2
Answer: c) H2O
5. Which of the following is a halogen?
a) Sodium
b) Potassium
c) Chlorine
d) Calcium
Answer: c) Chlorine
6. What is the atomic number of carbon?
a) 6
b) 8
c) 12
d) 16
Answer: a) 6
7. How many electrons are in the outermost energy level of a sulfur atom?
a) 4
b) 6
c) 8
d) 16
Answer: b) 6
8. Which of the following is a non-metal?
a) Sodium
b) Silicon
c) Phosphorus
d) Magnesium
Answer: c) Phosphorus
9. What is the chemical formula for methane?
a) CH3
b) C2H4
c) CH4
d) C6H12O6
Answer: c) CH4
10. Which subatomic particle is found in the nucleus of an atom?
a) Proton
b) Electron
c) Neutron
d) Positron
Answer: a) Proton
11. What is the chemical formula for table salt (sodium chloride)?
a) NaCl
b) KCl
c) HCl
d) CaCl2
Answer: a) NaCl
12. What is the process of a liquid turning into a gas at its boiling point called?
a) Condensation
b) Vaporization
c) Sublimation
d) Fusion
Answer: b) Vaporization
13. Which gas is commonly used in soda to create carbonation?
a) Oxygen
b) Hydrogen
c) Carbon dioxide
d) Nitrogen
Answer: c) Carbon dioxide
14. How many valence electrons does an atom of sulfur have?
a) 2
b) 6
c) 8
d) 16
Answer: b) 6
17. Which of the following is a transition metal?
a) Potassium
b) Iron
c) Neon
d) Fluorine
Answer: b) Iron
18. What is the chemical formula for hydrogen peroxide?
a) H2O2
b) H2O
c) HO
d) H3O+
Answer: a) H2O2
19. What is the most abundant element in the Earth’s crust?
a) Oxygen
b) Carbon
c) Silicon
d) Hydrogen
Answer: a) Oxygen
20. Which of the following is a greenhouse gas that is more potent than carbon dioxide?
a) Methane
b) Oxygen
c) Nitrogen
d) Helium
Answer: a) Methane
21. What is the chemical symbol for lead?
a) Li
b) Pb
c) Ld
d) Pd
Answer: b) Pb
22. Which type of chemical bond involves the sharing of electrons between atoms?
a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Hydrogen bond
Answer: b) Covalent bond
23. What is the chemical formula for ozone?
a) O2
b) CO2
c) O3
d) NO2
Answer: c) O3
23. Which of the following is a noble gas?
a) Neon
b) Fluorine
c) Phosphorus
d) Sodium
Answer: a) Neon
24. What is the chemical formula for ammonia?
a) NH4
b) NH3
c) H2O
d) N2
Answer: b) NH3
25. Which element is commonly used in fluorescent lighting?
a) Mercury
b) Argon
c) Xenon
d) Krypton
Answer: a) Mercury
26. What is the chemical formula for sulfuric acid?
a) HCl
b) H2SO4
c) NaOH
d) H2O
Answer: b) H2SO4
27. Which of the following is a radioactive element?
a) Iron
b) Uranium
c) Silver
d) Copper
Answer: b) Uranium
28. What is the chemical formula for acetic acid, which is found in vinegar?
a) CH4
b) C2H5OH
c) C6H12O6
d) CH3COOH
Answer: d) CH3COOH
29. Which element is essential for all organic compounds?
a) Oxygen
b) Carbon
c) Hydrogen
d) Nitrogen
Answer: b) Carbon
30. What is the chemical formula for hydrogen sulphide gas?
a) H2S
b) HS
c) S2H
d) H2SO4
Answer: a) H2S
31. Which gas is responsible for the blue colour of the Earth’s atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Ozone
Answer: b) Nitrogen