Chemistry

Question 1

1The main ore of aluminium is

Easy

A. haematite B. galena C. cassiterite D. bauxite

Question 2

2Gold in Ghana is often extracted from its ore by

Medium

A. reduction with carbon B. electrolysis of bauxite C. the Contact process D. cyanide leaching or amalgamation with mercury

Question 3

3Slag floats on molten iron in the blast furnace.

Easy

A. True B. False

Question 4

4The Haber process manufactures

Easy

A. nitric acid B. ammonia from nitrogen and hydrogen C. sulphuric acid D. sodium carbonate

Question 5

5Sacrificial protection uses a metal that is

Medium

A. more reactive than iron B. less reactive than iron C. equally reactive D. a non-metal

Question 6

6Galvanising protects iron by

Medium

A. coating it with tin B. painting it C. coating it with zinc, which corrodes in preference D. oiling it

Question 7

7Coating iron with zinc to prevent rusting is called ___.

Easy

Your answer (fill in the blank)

Question 8

8In the Contact process, SO₃ is absorbed in

Hard

A. sodium hydroxide B. water directly C. ammonia D. concentrated sulphuric acid to form oleum

Question 9

9Alloys are usually harder than the pure metals.

Easy

A. True B. False

Question 10

10Iron is extracted from haematite in the

Easy

A. Contact process B. blast furnace by reduction with carbon monoxide C. electrolysis of brine D. Haber process