Question

which of the following does not have a fixed melting and boiling point
(a)ethanol
(b)air
(c)oxygen
(d)gold

Answer 1

B. Air
as other three are compounds and elements with fixed boiling and melting points but air is a mixture.

Answer 2

Air does not have a fixed melting and boiling point.

Option (b).

Explanation:

• The oxygen, gold, ethanol are single compounds or substances which are having certain fixed melting points and boiling points respectively.

• But the air is a combination of several gases which were having different values for each gas as boiling and melting points.

• The melting points for oxygen, ethanol, and gold are -218 degree centigrade, -114 degree centigrade, 1064 degree centigrade respectively.

• The boiling points for oxygen, ethanol, and gold are -189 degree  centigrade, 78-degree centigrade, 2700 degrees centigrade respectively.

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