Unit 1: Fundamentals of Chemistry

Multiple Choice Question

---

1. What is the atomic number of Carbon?

A) 12
B) 6
C) 14
D) 8
Answer: B) 6

2. Which of the following is a noble gas?

A) Oxygen
B) Nitrogen
C) Argon
D) Chlorine
Answer: C) Argon

3. The molecular formula of water is:

A) H2O
B) H2O2
C) H2SO4
D) HO
Answer: A) H2O

4. Avogadro’s number is:

A) (6.022 \times 10^{23})
B) (6.022 \times 10^{22})
C) (6.022 \times 10^{24})
D) (6.022 \times 10^{21})
Answer: A) (6.022 \times 10^{23})

5. Which element has the highest electronegativity?

A) Oxygen
B) Fluorine
C) Nitrogen
D) Chlorine
Answer: B) Fluorine

6. What is the chemical symbol for Potassium?

A) P
B) Pt
C) K
D) Po
Answer: C) K

7. Which type of bond involves the sharing of electrons?

A) Ionic
B) Covalent
C) Metallic
D) Hydrogen
Answer: B) Covalent

8. The pH of a neutral solution at 25°C is:

A) 7
B) 14
C) 1
D) 0
Answer: A) 7

9. Which gas is commonly known as laughing gas?

A) CO2
B) N2O
C) NO
D) NH3
Answer: B) N2O

10. In which state of matter are molecules closest together?

A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: A) Solid