Question

Graphite is made artificially when a mixture of:

• A. sand and coke is heated electrically
• B. silicon and iron is heated electrically
• C. wood and iron is heated electrically
• D. bones and iron is heated electrically

Answer 1

Answer: (A)

sand and coke is heated electrically

They are made from petroleum coke and sand after it is mixed with coal tar pitch. They are then extruded and shaped, baked to carbonize the binder (pitch), and finally graphitized by heating it to temperatures approaching 3000 °C, at which the carbon atoms arrange into graphite.