20. M/J 2017/P11/Q3
Which statement about pure hexane, C6H14, is correct?
A It boils over a range of temperatures.
B It burns in excess oxygen to form carbon monoxide and water only.
C It mixes with water.
D It melts at a fixed temperature
Answer: D
Explaination
Pure alkanes have fixed melting and boiling point at a fixed temperature. In complete combustion of alkane they form CO2 and H2O not CO (carbon monooxide). All alkanes are insoluble in water. They all burn readily in excess of oxygen to form CO2 and H2O vapours.
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