1 When sodium reacts with water, what gas is produced? A Oxygen B Hydrogen C Chlorine D Carbon dioxide
2 Why do elements in the same group show similar chemical properties? A They have the same number of shells. B They have the same number of valence electrons. C They have the same atomic mass. D They have the same number of neutrons.
3 Which property describes the ability of a metal to be drawn into wires? A Malleability B Ductility C Conductivity D Lustre
5 Which block of the periodic table contains the transition metals? A s-block B p-block C d-block D f-block
6 Down a group, the ionisation energy generally: A Increases B Decreases C Remains constant D Becomes zero
7 Which scientist arranged elements in order of increasing atomic number in the modern periodic table? A Mendeleev B Moseley C Dalton D Rutherford
9 Which gas is the most abundant in the Earth's atmosphere? A Oxygen B Nitrogen C Carbon dioxide D Argon
11 Which layer of the atmosphere contains the ozone layer that protects us from harmful UV rays? A Troposphere B Mesosphere C Stratosphere D Thermosphere
12 Chlorofluorocarbons (CFCs) cause damage to which part of the atmosphere? A Ozone layer B Water vapour layer C Troposphere only D Particulate layer
13 Which gas is the main greenhouse gas responsible for global warming? A Nitrogen B Oxygen C Carbon dioxide D Argon
14 Which property generally decreases as you move from left to right across a period in the periodic table? A Atomic size B Ionisation energy C Electronegativity D Non-metallic character
15 Which scientist arranged the elements in the modern periodic table on the basis of increasing atomic number? A Mendeleev B Moseley C Dalton D Rutherford
17 Which of the following is the most reactive metal in the reactivity series? A Sodium B Potassium C Magnesium D Copper
19 What is the colour of bromine at room temperature? A Pale yellow-green B Red-brown C Purple-black D Colourless
20 In a displacement reaction, chlorine is added to potassium bromide solution. What will happen? A No reaction B Bromine will displace chlorine C Chlorine will displace bromine D Potassium will displace chlorine
21 Which of the following is a use of transition metals? A As fertilizers B As catalysts in industrial processes C As fuels D As inert gases in bulbs
22 As we move from left to right across a period, the atomic size of elements generally: A increases B decreases C remains the same D first increases then decreases
23 Which layer of the atmosphere is closest to the Earth's surface? A Stratosphere B Mesosphere C Troposphere D Thermosphere
24 Afforestation helps the environment by: A Increasing greenhouse gases B Absorbing carbon dioxide C Producing CFCs D Causing acid rain
25 Elements of the same group have similar chemical properties because they have the same: A Number of shells B Number of neutrons C Valence electrons D Atomic mass