Q.

Find out the temperature above which carbon can reduce MgO, for reaction MgOs+Cs→Mgs+COg ΔS0=197.67JK−1mol−1 and ΔH0=+491.18KJmol−1

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a

298K

b

248K

c

2484.8K

d

24800K

answer is C.

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Detailed Solution

For reduction to occur, the free energy change of the given process should be negative i.e ΔG0 is   −Ve∴TΔS0>ΔH0T(197.67)>491.18×103T>491.18197.67×10-3>2484.8K
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Find out the temperature above which carbon can reduce MgO, for reaction MgOs+Cs→Mgs+COg ΔS0=197.67JK−1mol−1 and ΔH0=+491.18KJmol−1