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Question

Metallic mercury is obtained by roasting mercury (II) sulphide in a limited amount of air. Estimate the temperature range in which the standard reaction is product - favoured.
HgS(s)+O2(g)Hg(l)+SO2(g)
Ho=238.6 kJ/mole and So=+36.7 J/moleK

A
When T>200 K
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B
When T>300 K
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C
At all temperatures
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D
None of these
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Solution

The correct option is C At all temperatures
Assume that H and S values do not depend on temperature.

As H0 is negative and S0 is positive, using the equation G0=H0TS0

G0 should be negative so the reaction is product-favoured.

H0TS0<0

In the question H0 is negative and S0 is positive and we know temperature is always positive. So, H0TS0 will be negative for all temperatures.

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