1. CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 11

2. Which statement about metals is true? 1.Metals conduct electricity only when solid. 2.Metals conduct electricity both as solids and as liquids. 3.Metals do not conduct when solid but do conduct when molten. 4.Metals do not conduct electricity either when solid or when liquid. :25

3. What are the main properties of aluminium being used when it is used to make aircraft bodies? 1.High density and high strength. 2.Good thermal and electrical conductivity. 3.High strength and good thermal conductivity. 4.High strength and low density. :25

4. Which of the following is a very reactive metal that is stored under oil? 1.Lithium. 2.Calcium. 3.Zinc. 4.Copper. :25

5. Which of the following shows the correct order of reactivity of the four metals starting with the most reactive? 1.copper, iron, zinc, calcium 2.calcium, iron, zinc, copper. 3.copper, zinc, iron, calcium. 4.calcium, zinc, iron, copper :25

6. Which metal shown below will not react with dilute hydrochloric acid? 1.Copper 2.Zinc 3.Iron 4.Magnesium :25

7. Which metal shown below can be extracted from its ore by heat alone? 1.Mercury 2.Zinc 3.Copper 4.Aluminium :25

8. Metal X has the following properties:- It does not react quickly with water; it can be obtained from its ore by heating with carbon and it displaces tin ions from solution. Which metal could be X? 1.Calcium 2.Zinc 3.Copper 4.Silver :25

9. What type of reaction occurs when a metal is extracted from its ore? 1.Displacement 2.Reduction 3.Oxidation 4.Precipitation :25

10. What are the two main reasons why the alloy, solder, is used to join metals together in electrical circuit boards? 1.It is corrosion resistant and very hard. 2.It has a low melting point and is corrosion resistant. 3.It is very hard and a good conductor. 4.It is a good conductor and has a low melting point. :25

11. Analysis of a hydrocarbon compound showed that it was composed of 75% carbon and 25% hydrogen by mass. What is the empirical formula of the compound? :60 1.CH 2.CH 3 3.CH 4 4.CH 2