1 When sodium reacts with water, which gas is produced? A Oxygen B Chlorine C Hydrogen D Carbon dioxide
2 Which of the following is a characteristic property of Group 1 elements (alkali metals)? A They are hard and have high density B They are soft and have low density C They are poor conductors of heat and electricity D They form coloured compounds
3 Which halogen is more reactive and can displace bromine from a solution of potassium bromide? A Iodine B Chlorine C Astatine D Fluorine
4 Which of the following is a use of chlorine? A In advertising signs B As a disinfectant in water treatment C As a fuel in rockets D In making electric wires
5 Which property makes noble gases unreactive? A They have a stable electronic structure. B They have high electronegativity. C They readily lose electrons. D They form diatomic molecules.
7 What is the product when sodium reacts with water? A Sodium oxide and hydrogen B Sodium hydroxide and hydrogen C Sodium chloride and oxygen D Sodium hydride and oxygen
8 In a displacement reaction, which halogen can displace bromine from a solution of potassium bromide? A Iodine B Chlorine C Bromine D Fluorine
9 Which noble gas is used in balloons because it is less dense than air? A Neon B Argon C Helium D Radon
10 Which of the following is the correct flame colour for potassium? A Yellow B Lilac C Brick red D Blue
14 Why are transition elements often used as catalysts in chemical reactions? A They have low melting points. B They show variable oxidation states. C They are monatomic gases. D They are non-metals with high reactivity.
15 Which of the following is a characteristic of transition elements? A They have only one oxidation state B They form colourless compounds C They show variable oxidation states D They are all gases at room temperature
16 What is observed when sodium reacts with water? A A gas that extinguishes a burning splint with a pop sound is produced. B A gas that turns limewater milky is produced. C A gas that relights a glowing splint is produced. D A gas that turns damp litmus paper blue is produced.
17 Why are noble gases chemically unreactive? A They have a stable electronic structure B They are metals C They have high reactivity D They form diatomic molecules
18 Transition elements are often used as catalysts because they: A Provide a surface for reactions and can change oxidation state B Are very cheap and abundant C Have low melting points D Are non-metals
19 Which of the following is a property of metals? A They are brittle B They are good conductors of heat and electricity C They have low melting points D They are non-lustrous
20 Which of the following is a property of non-metals? A They are malleable and ductile B They are good conductors of electricity C They are brittle and poor conductors D They have a shiny surface
21 Which property allows metals to be drawn into wires? A Malleability B Ductility C Brittleness D Conductivity
22 Which halogen is more reactive: chlorine or bromine? A Chlorine B Bromine C Both are equally reactive D Neither is reactive
23 Noble gases are chemically inert because they have: A One electron in the outermost shell B A stable electronic configuration C Unpaired electrons D High reactivity
24 Which property describes the ability of a metal to be drawn into wires? A Malleability B Ductility C Conductivity D Lustre
25 Which statement about transition elements is correct? A They form only one type of ion B They form coloured compounds C They are all non-metals D They are poor catalysts