Time for Test: Chemical Bonding

1. What is a chemical bond?

a) A physical mixture b) A force holding atoms or ions together c) A chemical reaction d) An energy change

2. Which type of bond involves transfer of electrons?

a) Covalent b) Metallic c) Ionic d) Hydrogen

3. Ionic bonding usually occurs between:

a) Two metals b) Two non-metals c) A metal and a non-metal d) Noble gases

4. A positively charged ion is called:

a) Anion b) Electron c) Cation d) Molecule

5. Which compound is ionic?

a) H₂O b) CO₂ c) NaCl d) CH₄

6. Covalent bonding involves:

a) Transfer of electrons b) Sharing of electrons c) Loss of protons d) Attraction of ions

7. Which of the following is a covalent compound?

a) KCl b) CaO c) H₂O d) Na₂O

8. A double bond means:

a) One shared pair of electrons b) Two shared pairs of electrons c) Two transferred electrons d) No electrons involved

9. Which molecule has a triple bond?

a) O₂ b) CO₂ c) N₂ d) H₂O

10. Metallic bonding is best described as:

a) Sharing of electrons b) Transfer of electrons c) Attraction between ions and delocalised electrons d) Weak forces

11. Which property of metals is explained by metallic bonding?

a) Brittleness b) Electrical conductivity c) Low melting point d) Insolubility

12. Which element conducts electricity well due to metallic bonding?

a) Sulfur b) Copper c) Oxygen d) Chlorine

13. Which diagram is used to show electron transfer or sharing?

a) Energy diagram b) Dot and cross diagram c) Bar chart d) Flow chart

14. Which compound contains covalent bonds only?

a) CaBr₂ b) KCl c) SiH₄ d) Na₂O

15. Which statement correctly compares ionic and covalent bonding?

a) Both involve electron transfer b) Ionic shares electrons, covalent transfers c) Ionic transfers electrons, covalent shares d) Both occur in metals