Chemistry Important MCQs (Document Form)
Instructions: Read each question carefully and select the correct option. Answers are
provided below each question.
1. Atomic number of Oxygen is?
A) 6
B) 8
C) 16
D) 18 Answer: B) 8
2. The chemical formula of water is?
A) H2O
B) CO2
C) O2
D) H2SO4 Answer: A) H2O
3. Which gas is known as laughing gas?
A) CO2
B) N2O
C) NO2
D) NH3 Answer: B) N2O
4. The valency of Carbon is?
A) 2
B) 3
C) 4
D) 1 Answer: C) 4
5. pH of pure water is?
A) 5
B) 6
C) 7
D) 8 Answer: C) 7
6. NaCl is commonly known as?
A) Baking Soda
B) Salt
C) Vinegar
D) Caustic Soda Answer: B) Salt
7. Which element is liquid at room temperature?
A) Mercury
B) Bromine
C) Both A and B
D) Sodium Answer: C) Both A and B
8. Atomic mass of Hydrogen is?
A) 1
Instructions: Read each question carefully and select the correct option. Answers are
provided below each question.
1. Atomic number of Oxygen is?
A) 6
B) 8
C) 16
D) 18 Answer: B) 8
2. The chemical formula of water is?
A) H2O
B) CO2
C) O2
D) H2SO4 Answer: A) H2O
3. Which gas is known as laughing gas?
A) CO2
B) N2O
C) NO2
D) NH3 Answer: B) N2O
4. The valency of Carbon is?
A) 2
B) 3
C) 4
D) 1 Answer: C) 4
5. pH of pure water is?
A) 5
B) 6
C) 7
D) 8 Answer: C) 7
6. NaCl is commonly known as?
A) Baking Soda
B) Salt
C) Vinegar
D) Caustic Soda Answer: B) Salt
7. Which element is liquid at room temperature?
A) Mercury
B) Bromine
C) Both A and B
D) Sodium Answer: C) Both A and B
8. Atomic mass of Hydrogen is?
A) 1
