CHEMISTRY QUESTION AND
ANSWERS
1. What is the atomic number of oxygen?
A) 6
B) 8
C) 16
D) 12
Answer: B) 8
2. Which subatomic particle has a negative charge?
A) Proton
B) Neutron
C) Electron
D) Nucleon
Answer: C) Electron
3. What is the molar mass of water (H₂O)?
A) 18 g/mol
B) 20 g/mol
C) 10 g/mol
D) 16 g/mol
Answer: A) 18 g/mol
4. Which gas is produced during the reaction of acids with metals?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide
Answer: C) Hydrogen
5. Which element is a noble gas?
A) Nitrogen
B) Neon
C) Oxygen
D) Fluorine
Answer: B) Neon
, 6. What is the pH of a neutral solution at 25°C?
A) 0
B) 7
C) 14
D) 1
Answer: B) 7
7. Which type of bond involves the sharing of electrons?
A) Ionic bond
B) Hydrogen bond
C) Metallic bond
D) Covalent bond
Answer: D) Covalent bond
8. Which of the following is an alkali metal?
A) Calcium
B) Magnesium
C) Potassium
D) Aluminum
Answer: C) Potassium
9. What is the chemical formula of sulfuric acid?
A) HCl
B) HNO₃
C) H₂SO₄
D) H₂CO₃
Answer: C) H₂SO₄
10. Which law states that mass is neither created nor destroyed?
A) Law of Constant Proportions
B) Law of Conservation of Mass
C) Law of Multiple Proportions
D) Dalton’s Law
Answer: B) Law of Conservation of Mass
11. What is the number of neutrons in Carbon-14?
A) 6
ANSWERS
1. What is the atomic number of oxygen?
A) 6
B) 8
C) 16
D) 12
Answer: B) 8
2. Which subatomic particle has a negative charge?
A) Proton
B) Neutron
C) Electron
D) Nucleon
Answer: C) Electron
3. What is the molar mass of water (H₂O)?
A) 18 g/mol
B) 20 g/mol
C) 10 g/mol
D) 16 g/mol
Answer: A) 18 g/mol
4. Which gas is produced during the reaction of acids with metals?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide
Answer: C) Hydrogen
5. Which element is a noble gas?
A) Nitrogen
B) Neon
C) Oxygen
D) Fluorine
Answer: B) Neon
, 6. What is the pH of a neutral solution at 25°C?
A) 0
B) 7
C) 14
D) 1
Answer: B) 7
7. Which type of bond involves the sharing of electrons?
A) Ionic bond
B) Hydrogen bond
C) Metallic bond
D) Covalent bond
Answer: D) Covalent bond
8. Which of the following is an alkali metal?
A) Calcium
B) Magnesium
C) Potassium
D) Aluminum
Answer: C) Potassium
9. What is the chemical formula of sulfuric acid?
A) HCl
B) HNO₃
C) H₂SO₄
D) H₂CO₃
Answer: C) H₂SO₄
10. Which law states that mass is neither created nor destroyed?
A) Law of Constant Proportions
B) Law of Conservation of Mass
C) Law of Multiple Proportions
D) Dalton’s Law
Answer: B) Law of Conservation of Mass
11. What is the number of neutrons in Carbon-14?
A) 6
