1993 - WAEC Chemistry Past Questions and Answers - page 4
31
When ammonium chloride is dissolved in water in a test tube, the tube feels colder showing that
A
the solution is unsaturated
B
sublimation has ocurred
C
ammonia gas is evolved
D
the process is endothermic
32
Zinc displaces copper from an aqueous solution of copper (ll) salt because
A
copper is a transition element
B
copper is a moderately reactive metal
C
Zinc and copper have reducing prperties
D
zinc is more reactive than copper
33
The alloy used for metal work and plumbing contains
A
lead and tin
B
iron and carbon
C
copper and tin
D
aluminium and copper
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