ICSE Class 8 Answered

Diamond

Graphite

1.Pure diamond is colourless and transparent.

1.Graphite is grayish black, opaque and shiny.

2.It is the hardest naturally occurring substance.

2.It is soft and greasy to touch.

3.It has high density, i.e, 3.5 g/cm³.

3.It has a comparatively low density, i.e, 2.39 g/cm³.

4.It is a bad conductor of electricity.

4.It is good conductor of electricity.

5.It burns in air at 900oC to form carbon dioxide.

5.It burns in air at 700^oC to form carbon dioxide.