When the diamond is heated at 1800 - 2000∘C in a vacuum it converts into:
graphite
coke
CO2
CO + CO2
A
CO + CO2
B
graphite
C
CO2
D
coke
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Solution
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Graphite is the most stable allotrope of carbon and hence all other allotropes turn into graphite at higher temperatures. Diamond turns into graphite at a temperature between 1800K and 2000K.
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