10-minute Quiz : Ch10 Occurrence and extraction of metals

Iron is the most abundant metal in the Earth’s crust.

• A. True
• B. False

Which of the following statements concerning metal ores is/are correct?

(1) Metal ores are found in the Earth’s crust and they are renewable.

(2) Metals exist as either free elements or compounds in metal ores.

(3) Extraction of metals must involve reduction of metal ores.

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

Which of the following properties are considered important when choosing a metal for making electric wires?

(1) High electrical conductivity

(2) Good ductility

(3) Low melting point

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following properties are considered important when choosing a metallic substance for making nail clippers?

(1) High malleability

(2) High corrosion resistance

(3) High mechanical strength

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Refer to the information in the table. Which material is the best for making kitchen foil?

• A. P

• B. Q

• C. R

• D. S

Complete the following sentence with suitable words.

In general, the more stable the compounds (e.g. oxides) present in a metal ore, the more (a) _____________________ to extract the metal from its ore, and the (b) ________________ the metal was discovered in history.

• A. (a) difficult it is; (b) later

• B. (a) easily it is; (b) earlier

Tin is more reactive than lead but less reactive than iron. Which of the following methods may be most suitable for extracting tin from tin(II) oxide?

• A. Physical separation
• B. Heating tin(II) oxide strongly
• C. Heating tin(II) oxide with carbon powder
• D. Electrolysis of molten tin(II) oxide

Which of the following experiments would produce a metal?

(1) Heating silver oxide

(2) Heating copper(II) oxide

(3) Heating iron(III) oxide with carbon monoxide

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following methods can be used to obtain calcium from calcium compounds?

• A. Heating calcium carbonate strongly
• B. Heating calcium oxide with carbon
• C. Mixing calcium oxide with dilute hydrochloric acid
• D. Electrolysis of molten calcium fluoride

The diagram shows a set-up for extracting a metal from its compound. Which of the following compounds may X be?

(1) HgO

(2) ZnO

(3) Cu₂S

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only