GACE Chemistry Original Chemistry
Certification Examination Questions
and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. Which subatomic particle determines the atomic number of an element?
A. Electron
B. Neutron
C. Proton
D. Nucleus
Correct Answer: C. Proton
Rationale: The atomic number equals the number of protons in an atom’s nucleus
and defines the element.
2. Which principle states that matter is neither created nor destroyed during a
chemical reaction?
A. Law of Multiple Proportions
B. Law of Conservation of Mass
C. Boyle’s Law
D. Charles’s Law
Correct Answer: B. Law of Conservation of Mass
Rationale: The total mass of reactants equals the total mass of products in a
chemical reaction.
,3. Which type of bond involves the transfer of electrons between atoms?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Metallic bond
Correct Answer: C. Ionic bond
Rationale: Ionic bonds form when electrons are transferred, creating oppositely
charged ions.
4. What is the SI unit for temperature?
A. Celsius
B. Kelvin
C. Fahrenheit
D. Joule
Correct Answer: B. Kelvin
Rationale: Kelvin is the SI base unit for thermodynamic temperature.
5. Which element is a noble gas?
A. Chlorine
B. Oxygen
C. Neon
D. Sodium
Correct Answer: C. Neon
Rationale: Neon belongs to Group 18, the noble gas family.
6. Which particle has a negative charge?
A. Proton
B. Neutron
,C. Electron
D. Nucleus
Correct Answer: C. Electron
Rationale: Electrons carry a negative electrical charge.
7. Which equation represents the relationship between density, mass, and
volume?
A. Density = mass × volume
B. Density = volume ÷ mass
C. Density = mass ÷ volume
D. Density = mass + volume
Correct Answer: C. Density = mass ÷ volume
Rationale: Density is calculated by dividing the mass of a substance by its volume.
8. Which gas law describes the inverse relationship between pressure and
volume?
A. Charles’s Law
B. Boyle’s Law
C. Avogadro’s Law
D. Dalton’s Law
Correct Answer: B. Boyle’s Law
Rationale: Boyle’s Law states that pressure increases as volume decreases at
constant temperature.
9. Which type of reaction combines substances to form a single product?
A. Decomposition
B. Synthesis
, C. Combustion
D. Replacement
Correct Answer: B. Synthesis
Rationale: A synthesis reaction combines two or more reactants to form one
product.
10. Which value represents a neutral solution at 25°C?
A. pH 2
B. pH 5
C. pH 7
D. pH 12
Correct Answer: C. pH 7
Rationale: A neutral solution has equal hydrogen ion and hydroxide ion
concentrations.
11. Which instrument is used to measure liquid volume accurately in a titration?
A. Balance
B. Burette
C. Thermometer
D. Crucible
Correct Answer: B. Burette
Rationale: Burettes deliver precise volumes of liquid during titrations.
12. Which type of change produces a new chemical substance?
A. Physical change
B. Chemical change
C. Phase change
D. Size change
Certification Examination Questions
and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which subatomic particle determines the atomic number of an element?
A. Electron
B. Neutron
C. Proton
D. Nucleus
Correct Answer: C. Proton
Rationale: The atomic number equals the number of protons in an atom’s nucleus
and defines the element.
2. Which principle states that matter is neither created nor destroyed during a
chemical reaction?
A. Law of Multiple Proportions
B. Law of Conservation of Mass
C. Boyle’s Law
D. Charles’s Law
Correct Answer: B. Law of Conservation of Mass
Rationale: The total mass of reactants equals the total mass of products in a
chemical reaction.
,3. Which type of bond involves the transfer of electrons between atoms?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Metallic bond
Correct Answer: C. Ionic bond
Rationale: Ionic bonds form when electrons are transferred, creating oppositely
charged ions.
4. What is the SI unit for temperature?
A. Celsius
B. Kelvin
C. Fahrenheit
D. Joule
Correct Answer: B. Kelvin
Rationale: Kelvin is the SI base unit for thermodynamic temperature.
5. Which element is a noble gas?
A. Chlorine
B. Oxygen
C. Neon
D. Sodium
Correct Answer: C. Neon
Rationale: Neon belongs to Group 18, the noble gas family.
6. Which particle has a negative charge?
A. Proton
B. Neutron
,C. Electron
D. Nucleus
Correct Answer: C. Electron
Rationale: Electrons carry a negative electrical charge.
7. Which equation represents the relationship between density, mass, and
volume?
A. Density = mass × volume
B. Density = volume ÷ mass
C. Density = mass ÷ volume
D. Density = mass + volume
Correct Answer: C. Density = mass ÷ volume
Rationale: Density is calculated by dividing the mass of a substance by its volume.
8. Which gas law describes the inverse relationship between pressure and
volume?
A. Charles’s Law
B. Boyle’s Law
C. Avogadro’s Law
D. Dalton’s Law
Correct Answer: B. Boyle’s Law
Rationale: Boyle’s Law states that pressure increases as volume decreases at
constant temperature.
9. Which type of reaction combines substances to form a single product?
A. Decomposition
B. Synthesis
, C. Combustion
D. Replacement
Correct Answer: B. Synthesis
Rationale: A synthesis reaction combines two or more reactants to form one
product.
10. Which value represents a neutral solution at 25°C?
A. pH 2
B. pH 5
C. pH 7
D. pH 12
Correct Answer: C. pH 7
Rationale: A neutral solution has equal hydrogen ion and hydroxide ion
concentrations.
11. Which instrument is used to measure liquid volume accurately in a titration?
A. Balance
B. Burette
C. Thermometer
D. Crucible
Correct Answer: B. Burette
Rationale: Burettes deliver precise volumes of liquid during titrations.
12. Which type of change produces a new chemical substance?
A. Physical change
B. Chemical change
C. Phase change
D. Size change
