#Chemistry Grade 11 Unit 2 MCQ with answers and Explanation
#Target grade: Grade 11 and 12


1. Which type of chemical bond involves a "sea of delocalized electrons"?
A. Ionic
B. Covalent
C. Metallic
D. Hydrogen

2. Which pair of elements is most likely to form a covalent compound?
A. Sodium and Chlorine
B. Carbon and Oxygen
C. Magnesium and Oxygen
D. Potassium and Fluorine

3. How many lone pairs of electrons are present in the Lewis structure of water (H₂O)?
A. 1
B. 2
C. 3
D. 4

4. Which molecule violates the octet rule?
A. CH₄
B. BF₃
C. NH₃
D. CO₂

5. Which of the following is a property of ionic compounds?
A. Low melting point
B. Conducts electricity in solid state
C. Soluble in organic solvents
D. Forms crystals

6. Which bond is the most polar?
A. H-Cl
B. H-O
C. H-F
D. H-N

7. Which compound contains a coordinate covalent bond?
A. O₂
B. NH₄⁺
C. CO₂
D. NaCl

8. How many resonance structures does the nitrate ion (NO₃⁻) have?
A. 1
B. 2
C. 3
D. 4

Answers and Explanations:

1. Answer: C. Metallic bonds are characterized by delocalized electrons in metals.

2. Answer: B. Nonmetals (C and O) share electrons covalently.

3. Answer: B. Oxygen has two lone pairs in H₂O.

4. Answer: B. BF₃ has only six electrons around boron.

5. Answer: D. Ionic compounds form crystalline solids.

6. Answer: C. H-F has the greatest electronegativity difference.

7. Answer: B. NH₄⁺ has a coordinate bond from H⁺ to NH₃.

8. Answer: C. NO₃⁻ exhibits three resonance structures.


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