1 Covalent compounds are usually: A Good conductors in solid state B Soluble in water always C Poor conductors of electricity D Very hard and brittle
2 Electronegativity of non-metals means their tendency to: A Lose electrons B Gain electrons C Share electrons equally D Form cations
3 Metals are malleable and ductile because: A Layers of ions can slide over each other B They have strong covalent bonds C They have weak intermolecular forces D They contain discrete molecules
4 Which of the following is NOT a step in determining the empirical formula? A Convert masses to moles B Divide by the smallest number of moles C Multiply by Avogadro's number D Write the simplest whole-number ratio
5 Which type of bond is formed when one atom donates a lone pair of electrons to another atom that has an empty orbital? A Ionic bond B Covalent bond C Coordinate covalent bond D Metallic bond
6 In a chemical equation, what does the symbol (s) after a formula indicate? A Solid state B Aqueous solution C Gas D Liquid
7 Which bond is formed when one atom provides both electrons for sharing? A Ionic bond B Covalent bond C Coordinate covalent bond D Metallic bond
8 آئینی مرکب کی فارمولا اکائی کیا ہے؟ A سب سے چھوٹی دہرائی جانے والی اکائی جو آئنوں کا تناسب ظاہر کرے B دو غیر دھاتوں سے بنا مالیکیول C ایک آئن کی کمیت D ایک مول میں آئنوں کی تعداد
9 In the periodic table, electropositive character generally __________ down a group. A increases B decreases C remains constant D first decreases then increases
10 The empirical formula of a compound is CH₂O. Its molecular formula could be: A CH₂O B C₂H₄O₂ C C₃H₆O₃ D All of these
11 Electronegativity is the tendency of an atom to: A Lose electrons B Gain electrons C Attract shared electrons towards itself D Donate a lone pair of electrons
12 Ionic compounds conduct electricity when molten or dissolved because: A Their ions are free to move B Their molecules are free to move C They have delocalised electrons D They have weak intermolecular forces
13 In the reaction 2H₂ + O₂ → 2H₂O, how many moles of water are produced from 4 moles of H₂? A 2 moles B 4 moles C 6 moles D 8 moles
14 In the reaction N₂ + 3H₂ → 2NH₃, how many moles of NH₃ are produced from 2 moles of N₂? A 4 moles B 2 moles C 3 moles D 1 mole
15 What is the name of the compound formed when magnesium reacts with chlorine? A Magnesium chloride B Magnesium chlorate C Magnesium chlorite D Magnesium perchlorate
17 Electronegativity generally increases across a period because: A Atomic size increases B Nuclear charge increases C Number of shells increases D Metallic character increases
18 Which of the following is a giant covalent structure? A Sodium chloride B Diamond C Water D Carbon dioxide
19 Which of the following is the correct name for Al2O3? A Aluminium oxide B Aluminium trioxide C Dialuminium oxide D Aluminium oxygen
20 Which intermolecular force is the strongest? A London dispersion forces B Dipole-dipole forces C Hydrogen bonding D Ion-dipole forces
21 In a chemical equation, what does the symbol (aq) indicate? A Aqueous solution B Solid C Liquid D Gas
22 How many moles are present in 36 g of water? (H₂O = 18 g/mol) A 2 moles B 1 mole C 0.5 mole D 4 moles
23 36 گرام پانی (H₂O) میں کتنے مول ہیں؟ (H₂O کی مولر کمیت = 18 g/mol) A 1 مول B 2 مول C 0.5 مول D 3 مول
24 An ionic bond is formed between a metal and a non-metal by: A Sharing of electrons B Transfer of electrons C Overlapping of orbitals D Sharing of protons
25 What is the molecular formula of a compound? A The simplest whole-number ratio of atoms B The actual number of atoms of each element in one molecule C The arrangement of atoms in space D The mass of one mole of the compound