Carbon and its compounds

In combined state, carbon occurs as

• coal

• diamond

• graphite

• petroleum

A crystalline form of carbon is

• lampblack

• gas carbon

• sugar

• fullerene

Diamond is used for

• making the electrodes of electric furnaces.

• making crucible for melting metals.

• cutting and drilling rocks and glass.

• making carbon brushes for electric motors.

The type of coal with least carbon %

• peat

• lignite

• bituminous

• anthracite

________ is present in both living and non-living things

The tendency of an element to exist in two or more forms but in the same physical state is called ______________.

____________ and ____________ are the two major crystalline allotropes of carbon.

___________ is the hardest substance that occurs naturally.

The name ‘carbon’ is derived from the Latin word ______

Water gas

• CO and H2

• CO2 and H2O

• H2O vapours

• none of the above