Chemical Bond

A compound is formed when element Y reacts with element Z. Which of the following is the correct physical property of the compound. (SBP 2020, Q21)

• Highly volatile

• high melting point

• exist as liquid at room temperature

• does not conduct electricity

Which of the following statements is correct about J and W

• The electron arrangement of atom J is 2.6 while atom W is 2.8.1

• Atom J has one valence electron while atom W has six valence electrons

• Atom J accepts one electron while atom W releases two electrons during formation of bond

• atom J contributes two electrons and atom W contributes one electron to form the compound

Which statement about the bonding in carbon dioxide molecule is not correct? [Proton number: C = 6, O = 8] (SPMRSM 2020, Q24)

• Both carbon and oxygen atoms have achieved stable octet electron arrangement

• Carbon atom shares its four electrons with one oxygen atom

• Each oxygen atom shares two electrons with one carbon atom

• Two double covalent bonds are formed

Which compound is formed by transferring electrons? (SPMRSM 2020, Q21)

• Ammonia

• Lithium oxide

• Carbon monoxide

• Hydrogen chloride

Which of the following are incorrect about the water molecule? (Melaka 2020, Q43)

• Each hydrogen atom donates one valence electron.

• Oxygen atom share two electrons with two hydrogen atoms

• One single covalent bond is formed in the molecule.

• Hydrogen atoms and oxygen atom achieved a stable octet electron arrangement.

Which pair is matched correctly? (Kelantan 2020, Q6)

• Magnesium oxide, MgO. Covalent

• Lithium chloride, LiCl. Ionic

• Sodium chloride, NaCl. Covalent

• Butane, C₄H₁₀. Ionic

Which of the following statements is (are) true about metallic bond?

• the bond is formed between an electropositive element and an electronegative atom

• the strength of the bond increases with the atomic size of the metal

• the valence electron can move freely throughout the metallic lattice

Which of the following substances have dative bonds?

• NH⁺₄

• H₂O

• H₃O⁺

• CO₂

Ethanol, C₂H₅OH is soluble in water due to the formation of

• dative bond

• metallic bond

• hydrogen bond

• covalent bond

Which of the following statements is true about the giant covalent molecule?

• Very large structure, usually exists as solids, liquids and gases

• Van der Waals attraction forces between molecules are weak

• High melting and boiling point

• Weak covalent bond