Complete the following sentences:
When a diamond is heated at about 1600^oC in the absence of oxygen, it is ………

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Solution

Chemically diamond is composed of carbon atoms. The temperature involves the heating of carbon atoms in absence of oxygen. So, when the diamond is heated in absence of air, we get graphite.
In the absence of oxygen, diamonds can be heated to much higher temperatures. At 1600^oC temperatures, diamond crystals transform into graphite.
Thus when a diamond is heated at about 1600^oC in the absence of oxygen, it is transformed into graphite.

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Question 49
What happens when?

(a) ${ZnCO}_{3}$ is heated in the absence of oxygen?
(b) a mixture of ${Cu}_{2} O$ and ${Cu}_{2} S$ is heated?

1500

^{\circ}

Z n C O_{3}

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