1 Why do covalent compounds generally have low melting and boiling points? A They have strong ionic bonds B They have weak intermolecular forces C They contain a sea of electrons D They are giant covalent structures
2 What is the name of the compound with formula N₂O₄? A Nitrogen tetroxide B Dinitrogen tetroxide C Nitrogen oxide D Dinitrogen oxide
3 Which intermolecular force is the strongest? A London dispersion forces B Dipole-dipole forces C Hydrogen bonding D Ion-dipole forces
4 Which property of metals allows them to be drawn into wires? A Conductivity B Malleability C Ductility D Brittleness
5 In a coordinate covalent bond, the shared electron pair is provided by: A Both atoms equally B One atom only C A third atom D The nucleus of one atom
6 Which rule states that atoms tend to have eight electrons in their valence shell? A Duplet rule B Octet rule C Triplet rule D Valence rule
7 Which of the following is the correct name for the compound MgCl₂? A Magnesium chloride B Magnesium dichloride C Magnesium chlorate D Magnesium chlorite
8 Which of the following correctly describes the trend in electropositive character of metals? A It decreases down a group and increases across a period B It increases down a group and decreases across a period C It remains constant across a period D It increases across a period and decreases down a group
9 Which of the following is the correct name for the compound N₂O₄? A Dinitrogen tetroxide B Nitrogen oxide C Nitrogen tetroxide D Dinitrogen oxide
10 Which type of bonding is present in diamond? A Ionic bonding B Metallic bonding C Giant covalent bonding D Hydrogen bonding
11 Atoms form chemical bonds mainly to: A Increase their mass B Attain a stable electronic configuration C Become radioactive D Change their atomic number
12 Which type of bond is formed by the transfer of electrons from a metal to a non-metal? A Covalent bond B Coordinate covalent bond C Ionic bond D Metallic bond
13 What is the name of the compound with formula MgCl2? A Magnesium chloride B Magnesium dichloride C Magnesium chlorine D Manganese chloride
14 The metallic bond is best described as: A A sea of delocalised electrons surrounding metal ions B A shared pair of electrons between two non-metals C A complete transfer of electrons D A hydrogen bond between molecules
15 Which of the following is a correct name for the covalent compound N₂O₄? A Dinitrogen tetroxide B Nitrogen oxide C Nitrogen tetroxide D Dinitrogen oxide
16 Which of the following substances is likely to have a giant covalent structure? A Sodium chloride B Diamond C Water D Carbon dioxide
17 Which bond is present in a molecule of chlorine (Cl2)? A Single covalent bond B Double covalent bond C Triple covalent bond D Ionic bond
18 How many moles are present in 36 g of water (H2O)? (Molar mass of H2O = 18 g/mol) A 2 moles B 1 mole C 0.5 mole D 4 moles
19 Which type of bonding is present in a giant covalent structure such as diamond? A Ionic bonding B Metallic bonding C Covalent bonding D Hydrogen bonding
20 Electronegativity generally increases across a period because: A Atomic size increases B Nuclear charge increases C Number of shells increases D Metallic character increases
21 In a coordinate covalent bond, the electron pair is: A Shared equally by two atoms B Donated by one atom only C Transferred completely to one atom D Provided by both atoms equally
22 Which of the following is the correct name for the compound PCl₅ using prefixes? A Phosphorus pentachloride B Phosphorus chloride C Monophosphorus pentachloride D Phosphorus hexachloride
23 Which of the following forces is the weakest intermolecular force? A London dispersion forces B Dipole-dipole forces C Hydrogen bonding D Ionic bonding
24 In a balanced chemical equation, the number of atoms of each element on both sides is: A equal B different C greater on reactant side D greater on product side
25 According to the law of conservation of mass, in a chemical reaction: A Mass is gained B Mass is lost C Mass remains constant D Mass changes unpredictably