2 Which type of bond is formed by the transfer of electrons from a metal to a non-metal? A Covalent bond B Ionic bond C Metallic bond D Hydrogen bond
4 The duplet rule is applicable to which of the following elements? A Oxygen B Hydrogen C Chlorine D Sodium
6 Which of the following is an example of a molecule that follows the octet rule? A H2 B He C CH4 D LiH
7 Which of the following is a property of ionic compounds? A They are generally gases at room temperature. B They have low melting and boiling points. C They conduct electricity in molten state. D They are insoluble in water.
8 Which of the following statements about covalent compounds is true? A They conduct electricity in aqueous solution. B They have high melting and boiling points. C They are usually soluble in water. D They are generally poor conductors of electricity.
10 Which statement correctly describes the formation of an ionic bond? A Electrons are shared equally between two non-metal atoms B Electrons are transferred from a metal atom to a non-metal atom, forming oppositely charged ions C Electrons are shared unequally between two metal atoms D Protons are transferred from one atom to another
11 Which of the following correctly compares ionic and covalent compounds? A Ionic compounds are usually gases, while covalent compounds are solids. B Ionic compounds conduct electricity in molten state, while covalent compounds generally do not. C Covalent compounds have high melting points, while ionic compounds have low melting points. D Ionic compounds are soluble in organic solvents, while covalent compounds are soluble in water.
13 The duplet rule states that an atom tends to have how many electrons in its outermost shell? A 2 B 8 C 18 D 32
14 Which of the following atoms will most likely form a cation? A Chlorine B Oxygen C Sodium D Fluorine
15 The bond formed between two atoms of different electronegativities is generally: A Non-polar covalent B Polar covalent C Ionic D Metallic
18 What is the maximum number of electrons that can be accommodated in the first shell (K shell)? A 2 B 8 C 18 D 32
19 In a covalent bond between two identical atoms, the bond is: A polar covalent B nonpolar covalent C ionic D metallic
20 Which of the following pairs of elements would form an ionic bond? A H and O B Na and Cl C C and H D N and N
21 Which of the following best explains why an atom of chlorine (atomic number 17) forms a chloride ion (Cl⁻) with a 1− charge? A It loses one electron to achieve a stable duplet. B It gains one electron to complete its octet. C It shares one electron with another chlorine atom. D It gains one proton to become stable.
22 Which of the following statements about the octet rule is correct? A All atoms must have exactly 8 electrons in all shells B Atoms tend to gain, lose, or share electrons to have 8 electrons in their outermost shell C Only metals follow the octet rule D The octet rule applies only to hydrogen and helium
23 The main difference between ionic and covalent compounds is that: A ionic compounds are formed by sharing electrons while covalent compounds are formed by transfer of electrons B ionic compounds are formed by transfer of electrons while covalent compounds are formed by sharing electrons C both are formed by transfer of electrons D both are formed by sharing electrons