Question
Give points of differences : Coal and Coke
| Coal | Coke | ||
| $1.$ | It is hard as stone and black in colour. | $1.$ | It is tough, porous and black sub-stance. |
| $2.$ | Made from dead vegetation millions of year ago. | $2.$ | Made from reaction on coal. |
| $3.$ | The percentage of carbon depends on the types of coal. | $3.$ | The percentage of carbon is $87\%$ to $89 \%.$ |
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