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On the basis of above Ellingham diagram, select the incorrect statement.

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a

Carbon can be used to reduce any metal oxide at a high temperature.

b

Carbon reduces many oxides at elevated temperature because ΔfG⊖is temperature line with negative slope.

c

ΔS(C,CO)<ΔSC,CO2

d

Upto 710oC, formation of CO2 is more favourable energetically but above 710oc, the formation of CO is preferred.

answer is C.

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Detailed Solution

(i) C(s)+12O2(g)→CO(g) (ii) C(s)+O2(g)→CO2(g)∆S for reaction (i) is positive, since the number of moles of gases increases.∆S for reaction (ii) is zero, since there is no change in the number of moles of gases.

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On the basis of above Ellingham diagram, select the incorrect statement.