Test Yourself : Chapter 8 Covalent bonding

Which of the following molecules does NOT contain multiple covalent bonds?

• A. O₂
• B. CO₂
• C. HCN
• D. CH₄

Which of the following types of chemical bond is/are found in ammonium chloride?

(1) Ionic bond

(2) Metallic bond

(3) Dative covalent bond

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

Which of the following statements concerning a nitrogen molecule are correct?

(1) The number of bonding electrons contributed by each nitrogen atom in a nitrogen molecule is three.

(2) The total number of electrons in a nitrogen molecule is 10.

(3) A nitrogen molecule has two lone pairs of electrons.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

The table on the left shows the electronic arrangements of the atoms of four elements P, Q, R and S.

(P, Q, R and S are NOT the symbols of the elements.)

Which of the two elements would probably form a covalent compound?

• A. P and Q

• B. P and S

• C. R and S

• D. Q and R

Which of the following is the name of a covalent compound with the chemical formula CS₂?

• A. Carbon disulphide
• B. Monocarbon disulphide
• C. Dicarbon sulphide
• D. Carbon sulphide

Which of the following is the chemical formula of hydrogen iodide?

• A. HI
• B. HI₂
• C. H₂I
• D. H₂I₂

Which of the following pairs of elements would form a compound with the smallest formula mass?

(Relative atomic masses: N = 14.0, O = 16.0, F = 19.0, Si = 28.1, S = 32.1, Cl = 35.5, Ca = 40.1)

• A. Silicon and chlorine
• B. Nitrogen and fluorine
• C. Calcium and fluorine
• D. Oxygen and chlorine

Which of the combinations INCORRECTLY describes the type of bonding found in a substance?

• A
• B
• C
• D