General Chemistry MCQs

1. Which of the following is NOT a state of matter?

A) Solid
B) Gas
C) Plasma
D) Vapor

Answer: D) Vapor

2. The atomic number of an element is determined by the number of:

A) Protons
B) Neutrons
C) Electrons
D) Protons + Neutrons

Answer: A) Protons

3. Which of the following is a noble gas?

A) Oxygen
B) Nitrogen
C) Helium
D) Carbon

Answer: C) Helium

4. The chemical symbol for potassium is:

A) K
B) Po
C) Pt
D) Ka

Answer: A) K

5. Which of the following is a greenhouse gas?

A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Argon

Answer: C) Carbon dioxide

6. The process of rusting of iron is an example of:

A) Combustion
B) Oxidation
C) Reduction
D) Sublimation

Answer: B) Oxidation

7. What is the chemical formula for water?

A) HO
B) H2O2
C) H2O
D) HO2

Answer: C) H2O

8. The atomic mass of an element is determined by the number of:

A) Protons
B) Electrons
C) Neutrons
D) Protons + Neutrons

Answer: D) Protons + Neutrons

9. Which of the following is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Iron

Answer: B) Chlorine

10. The smallest unit of an element that retains its chemical properties is a(n):

A) Atom
B) Molecule
C) Ion
D) Electron

Answer: A) Atom

11. An acid turns blue litmus paper:

A) Red
B) Blue
C) Green
D) Yellow

Answer: A) Red

12. The SI unit for temperature is:

A) Celsius
B) Kelvin
C) Fahrenheit
D) Rankine

Answer: B) Kelvin

13. Which of the following is a non-metal?

A) Iron
B) Copper
C) Sulfur
D) Silver

Answer: C) Sulfur

14. The number of valence electrons in an atom of oxygen is:

A) 6
B) 8
C) 4
D) 2

Answer: A) 6

15. The chemical formula for ammonia is:

A) NH3
B) N2
C) H2O
D) NO3

Answer: A) NH3

16. The law that states mass cannot be created or destroyed in a chemical reaction is:

A) Boyle’s Law
B) Avogadro’s Law
C) Law of Conservation of Mass
D) Charles’s Law

Answer: C) Law of Conservation of Mass

17. A substance that speeds up a chemical reaction without being consumed itself is a(n):

A) Product
B) Reactant
C) Catalyst
D) Enzyme

Answer: C) Catalyst

18. The pH scale measures the acidity or alkalinity of a substance. A pH of 7 indicates:

A) Neutral
B) Acidic
C) Basic
D) Amphoteric

Answer: A) Neutral

19. The chemical symbol for gold is:

A) Gd
B) Au
C) Ag
D) Al

Answer: B) Au

20. Which of the following is a transition metal?

A) Sodium
B) Iron
C) Chlorine
D) Oxygen

Answer: B) Iron

21. An example of a heterogeneous mixture is:

A) Salt water
B) Air
C) Brass
D) Granite

Answer: D) Granite

22. The process of a gas changing directly to a solid is called:

A) Sublimation
B) Condensation
C) Deposition
D) Vaporization

Answer: C) Deposition

23. Which of the following elements is a noble gas?

A) Neon
B) Fluorine
C) Sulfur
D) Phosphorus

Answer: A) Neon

24. The chemical formula for table salt is:

A) Na2CO3
B) NaCl
C) HCl
D) H2SO4

Answer: B) NaCl

25. What is the formula for methane?

A) CH4
B) CO2
C) H2O
D) NH3

Answer: A) CH4

26. A substance that cannot be broken down into simpler substances by chemical means is a:

A) Mixture
B) Compound
C) Element
D) Solution

Answer: C) Element

27. The process of removing salt from seawater is called:

A) Filtration
B) Distillation
C) Evaporation
D) Sublimation

Answer: B) Distillation

28. Which of the following is a property of acids?

A) Bitter taste
B) Turns litmus paper blue
C) Reacts with metals to produce hydrogen gas
D) Slippery feel

Answer: C) Reacts with metals to produce hydrogen gas

29. The bond formed when electrons are transferred from one atom to another is called a(n):

A) Covalent bond
B) Metallic bond
C) Ionic bond
D) Hydrogen bond

Answer: C) Ionic bond

30. The chemical formula for sulfuric acid is:

A) H2SO4
B) HCl
C) NaOH
D) HNO3

Answer: A) H2SO4

31. Which of the following is a greenhouse gas?

A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium

Answer: C) Carbon dioxide

32. The process of converting a liquid into a gas is called:

A) Condensation
B) Evaporation
C) Sublimation
D) Deposition

Answer: B) Evaporation

33. The branch of chemistry concerned with the study of carbon compounds is called:

A) Organic chemistry
B) Inorganic chemistry
C) Physical chemistry
D) Biochemistry

Answer: A) Organic chemistry

34. Which of the following is a common unit for pressure?

A) Kelvin
B) Joule
C) Pascal
D) Ohm

Answer: C) Pascal

35. The formula mass of a substance is the sum of the atomic masses of all atoms in a:

A) Molecule
B) Mixture
C) Compound
D) Solution

Answer: A) Molecule

36. The process of a solid changing directly to a gas is called:

A) Sublimation
B) Condensation
C) Vaporization
D) Deposition

Answer: A) Sublimation

37. Which of the following is NOT a characteristic of metals?

A) High electrical conductivity
B) Brittle
C) Malleability
D) Ductility

Answer: B) Brittle

38. The chemical formula for glucose is:

A) C6H12O6
B) H2O
C) CO2
D) NaCl

Answer: A) C6H12O6

39. Which of the following is a property of bases?

A) Sour taste
B) Turns litmus paper red
C) Reacts with acids to form salts
D) Conducts electricity poorly

Answer: C) Reacts with acids to form salts

40. The SI unit for amount of substance is the:

A) Mole
B) Gram
C) Liter
D) Meter

Answer: A) Mole

41. Which of the following is a noble gas?

A) Neon
B) Fluorine
C) Chlorine
D) Sodium

Answer: A) Neon

42. The study of the flow of heat in chemical reactions is a part of:

A) Organic chemistry
B) Inorganic chemistry
C) Physical chemistry
D) Analytical chemistry

Answer: C) Physical chemistry

43. Which of the following elements is a metalloid?

A) Silicon
B) Iron
C) Sodium
D) Potassium

Answer: A) Silicon

44. The process of a gas changing into a liquid is called:

A) Sublimation
B) Condensation
C) Deposition
D) Vaporization

Answer: B) Condensation

45. The study of the composition of substances and the changes they undergo is:

A) Organic chemistry
B) Inorganic chemistry
C) Physical chemistry
D) Analytical chemistry

Answer: D) Analytical chemistry

46. Which of the following is an example of a chemical change?

A) Melting ice
B) Dissolving sugar in water
C) Burning wood
D) Cutting paper

Answer: C) Burning wood

47. The process by which a gas changes directly to a solid is called:

A) Sublimation
B) Condensation
C) Deposition
D) Evaporation

Answer: C) Deposition

48. The chemical formula for carbon dioxide is:

A) CO
B) CO2
C) C2O
D) CO3

Answer: B) CO2

49. The SI unit for electric current is the:

A) Watt
B) Joule
C) Ampere
D) Volt

Answer: C) Ampere

50. Which of the following is a common unit for energy?

A) Kelvin
B) Joule
C) Pascal
D) Ohm

Answer: B) Joule

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