1) Which gas contributes the largest part of air? a) Carbon dioxide b) Nitrogen c) Sulphur dioxide d) Oxygen 2) What is the average percentage of nitrogen in the air? a) 0.03% b) 7.8% c) 58% d) 78% 3) The following information shows the uses of a gas. What is the gas mentioned? a) Carbon dioxide b) Oxygen c) Nitrogen d) Helium 4) The diagram shows a pie chart that represents the composition of air in the atmosphere. Which of the following is true about X? a) Support combustion b) Turns limewater cloudy c) A by-product of combustion d) Its contents in inhaled air and exhaled air are the same 5) Among the positions A, B, C and D, which is the water position when the candle goes out? a) A b) B c) C d) D

Composition of Air

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