Understanding

7. Which of the following substances changes red litmus paper to blue when dissolved in water?A Sulphur dioxideB Carbon dioxideC Lithium oxide (a)D Sodium carbonate

8. The table below shows the pH value of four solutions which have the same concentration.

Solution pH valueP 2Q 7R 12S 13

Which of the following solutions has the highest concentration of hydroxide ion?A PB QC RD S (a)

9. Which of the following salts is soluble in water?A Iron (II) sulphate (a)B Silver chlorideC Calcium carbonateD Lead (II) bromide

10. Which one of the following compounds can undergo addition polymerisation?A CH3H2BrB CH3CH2CH3

C CH3CH = CH2 (a)D CH3COOH

11. An alloy Y is used to make a body of an aeroplane. Which of the following is alloy Y and its major component? Alloy Y Major componentA Duralumin MagnesiumB Duralumin Aluminium (a)C Bronze CopperD Cupronickel Copper