$\large {C_{(graphite)}}\, \rightleftharpoons \,{C_{(diamond)}};$
Favourable conditions for getting good yield of diamond (density of graphite and diamond are 2.3 g/ml, 3.5 g/ml).

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Low temperature, low pressure

Low temperature, high pressure

High temperature, high pressure

High tempreature, low pressure

answer is C.

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Detailed Solution

Since, graphite is themodynamically most stable allotrope of carbon, graphite to diamond is endothermic ;

Given density of graphite < density of diamond

We know, $d \propto \frac{1}{V}$

Since density of diamond is less than graphite, good yield of diamond is obtained at high pressure

Since graphite → diamond is endothermic, good yield of diamond is obtained at high temperature.

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