State whether the following statement is true or false: Coke is an almost pure form of carbon.
Write 'true' or 'false' against the following statements :
(a) Carbon constitutes 0.03% of the earth's crust.
(b) Graphite is the purest form of carbon.
(c) Coloured diamonds are costlier than colourless and transparent diamonds.
(d) Graphite has layers of hexagonal carbon bondings.
(e) Diamond is insoluble in all solvents.
Tick True/False against the following statements. (a) Fossil fuels can be made in the laboratory. (T/F) (b) CNG is more polluting fuel than petrol. (T/F) (c) Coke is the almost pure form of carbon. (T/F) (d) Coal tar is a mixture of various substances. (T/F) (e) Kerosene is not a fossil fuel. (T/F)
Write whether the following statement is true or false:
‘Coke is a tough, porous and black substance. It is an almost pure form of carbon.’