1 Afforestation helps the environment by: A Increasing greenhouse gases B Absorbing carbon dioxide C Producing CFCs D Causing acid rain
2 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
3 What is the trend in reactivity of Group 1 elements? A Reactivity decreases down the group B Reactivity increases down the group C Reactivity remains the same down the group D Reactivity first increases then decreases
5 Which of the following is a natural greenhouse gas? A CFCs B Water vapour C Sulphur dioxide D Carbon monoxide
6 Acid rain is mainly caused by the presence of which gases in the atmosphere? A Sulphur dioxide and nitrogen oxides B Carbon dioxide and oxygen C Nitrogen and argon D Water vapour and ozone
7 When a flame test is performed on a compound containing lithium, what colour is observed? A Crimson red B Yellow C Lilac D Blue-green
8 Which method helps reduce air pollution from vehicles? A Burning more coal B Using catalytic converters C Cutting down trees D Increasing factory smoke
9 Which of the following is the correct flame colour for potassium? A Yellow B Lilac C Brick red D Blue
10 Which of the following is a physical property of most metals? A They are dull and brittle B They are good conductors of heat and electricity C They have low density D They are poor conductors of electricity
11 Which gas is present in the highest percentage in the Earth's atmosphere? A Oxygen B Nitrogen C Carbon dioxide D Argon
14 Which gas is mainly responsible for acid rain? A Carbon monoxide B Sulphur dioxide C Oxygen D Nitrogen
17 What is the natural process that keeps the Earth warm called? A Acid rain B Greenhouse effect C Ozone depletion D Photochemical smog
18 Which of the following is a property of Group 17 elements? A They are monatomic gases B They exist as diatomic molecules C They are metals D They have low reactivity
19 Which property describes the ability of a metal to be drawn into wires? A Malleability B Ductility C Conductivity D Lustre
20 Why do transition elements show variable oxidation states? A Because they lose all their electrons easily B Because they have partially filled d-orbitals C Because they have full s-orbitals D Because they are all gases
21 Which of the following is a physical property of non-metals? A They are good conductors of heat B They are malleable and ductile C They are usually poor conductors of electricity D They have a shiny surface
22 Which gas is most abundant in the Earth's atmosphere? A Oxygen B Nitrogen C Carbon dioxide D Argon
23 What is the main effect of global warming? A Rise in sea levels B Decrease in Earth's temperature C Increase in ozone layer D Decrease in greenhouse gases
24 Which of the following is NOT a strategy to reduce environmental issues? A Afforestation B Using renewable energy C Increasing the use of fossil fuels D Waste management
25 Which gas is a major component of the atmosphere after nitrogen and oxygen? A Carbon dioxide B Argon C Neon D Helium