Which of the following metal is always a constituent of an amalgam?
Copper
Mercury
Iron
Zinc
The alloys which have mercury as a constituent are called amalgam.
Question 40 Identify the elements with the following property and arrange them in increasing order of their reactivity:
(a) An element which is a soft and a reactive metal.
(b) The metal which is an important constituent of limestone.
(c) The metal which exists in liquid state at room temperature.