10 Quick MCQs About Compounds and Their Correct Answers

Introduction to Compounds

Compounds form the cornerstone of chemistry, being substances composed of two or more different elements chemically bonded together. Understanding them is crucial for mastering chemical science. In this blog, we’ve compiled 10 multiple-choice questions (MCQs) related to compounds along with their correct answers and explanations.

MCQs on Chemical Compounds

1. Which of the following is a compound?
A) O₂
B) H₂O
C) Na
D) He
Answer: B) H₂O
Reason: H₂O (water) is a compound consisting of hydrogen and oxygen atoms bonded together.

2. What is the chemical formula for sodium chloride?
A) NaCl
B) NaOCl
C) KCl
D) NaOH
Answer: A) NaCl
Reason: NaCl is the common table salt composed of sodium (Na) and chloride (Cl) ions.

Advanced Questions

3. Which of the following compounds contains a triple bond?
A) H₂O
B) CO₂
C) N₂
D) C₂H₆
Answer: C) N₂
Reason: Nitrogen molecules (N₂) have a triple bond between two nitrogen atoms.

4. What type of compound is CH₄?
A) Ionic
B) Metallic
C) Covalent
D) Hydrogen
Answer: C) Covalent
Reason: Methane (CH₄) is a covalent compound formed by sharing electrons between carbon and hydrogen atoms.

5. Which of the following is an organic compound?
A) NaCl
B) H₂O
C) CO₂
D) CH₃OH
Answer: D) CH₃OH
Reason: CH₃OH (methanol) contains carbon and hydrogen, which qualify it as an organic compound.

Application-Based Questions

6. Which compound is used in baking bread?
A) NaOH
B) NaHCO₃
C) CaCO₃
D) NaCl
Answer: B) NaHCO₃
Reason: Sodium bicarbonate (NaHCO₃), also known as baking soda, is used in baking for leavening bread.

7. What kind of bond is present in NaCl?
A) Covalent
B) Ionic
C) Metallic
D) Hydrogen
Answer: B) Ionic
Reason: NaCl is an ionic compound formed by the transfer of an electron from sodium to chlorine.

8. HF is an example of which type of compound?
A) Acid
B) Base
C) Salt
D) Metal oxide
Answer: A) Acid
Reason: HF (hydrofluoric acid) is an acid due to its ability to donate a proton (H⁺).

9. What is the chemical formula of glucose?
A) C₁₂H₂₂O₁₁
B) C₆H₁₂O₆
C) C₃H₈O
D) C₂H₅OH
Answer: B) C₆H₁₂O₆
Reason: Glucose (C₆H₁₂O₆) is a simple sugar with a chemical formula representing six carbon, twelve hydrogen, and six oxygen atoms.

10. Which of the following is a polar compound?
A) O₂
B) H₂O
C) CCl₄
D) N₂
Answer: B) H₂O
Reason: Water (H₂O) is polar because of its bent structure and the difference in electronegativity between hydrogen and oxygen atoms.