The purest form of the amorphous carbon is
- AWood charcoal
- BSugar charcoal
- CBone charcoal
- DLamp black
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (b) Sugar charcoal
Explanation
Sugar charcoal, made by heating cane sugar without air or by dehydrating it with concentrated sulphuric acid, is the purest form of amorphous carbon, because sugar contains only carbon, hydrogen and oxygen.
Lamp black (soot) is also nearly pure carbon, while wood charcoal and bone charcoal contain mineral impurities.
Some answer keys give (d) Lamp black, which is also nearly pure carbon; sugar charcoal is usually named the purest form of amorphous carbon.