Please enter your email: 1.A metal reacts with dilute hydrochloric acid to produce a gas.What is used to identify this gas? A. a glowing splint B. a lighted splint C. damp blue litmus paper D. limewater 2.Why is carbon used in the purification of drinking water? . It desalinates the water. B. It disinfects the water. C. It filters out solids. D. It removes tastes and odours from the water. 3.Which element will burn in oxygen to form an acidic oxide? A. calcium B. carbon C. iron D. magnesium 4.The flow chart shows how impure water can be treated to produce drinkable water What is not removed from the water by this process? A. clay particles B. microbes C. nitrates D. odours 5.Oxygen is formed when manganese (IV) oxide is added to hydrogen peroxide, H2O2. 2H2O2 → 2H2O + O2 In this reaction, the manganese(IV) oxide acts as A. an acid. B. a base. C. a catalyst. D. a drying agent. 6.Oxygen was prepared from hydrogen peroxide and collected as shown in the diagram. 2H2O2 → 2H2O + O2 The first few tubes of gas were rejected because the gas was contaminated by A. water vapour. B. hydrogen peroxide. C. hydrogen. D. nitrogen. 7.The apparatus shown is used to measure the percentage by volume of oxygen in the air. What is substance X? A. anhydrous copper(II) sulphate B. calcium oxide C. carbon D. copper 8.Which gas is present in the light bulb? A argon B carbon dioxide C nitrogen D oxygen 9.Which gas can be removed from the exhaust gases of a petrol-powered car by its catalytic converter? A. carbon monoxide B. carbon dioxide C. nitrogen D. steam 10. Air is a mixture of gases. Which gas is present in the largest amount? A. argon B. carbon dioxide C. nitrogen D. oxygen Loading … Question 1 of 10
WhatsApp us for instant feedback