# GATE MT 2019 Q2. The variation of standard free energies for two oxides AO and BO with temperature are given below. The correct statement with reference to above figure is :

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Asked: 2020-06-07T08:24:03+05:30
2020-06-07T08:24:03+05:30In: Thermodynamics & Rate Processes

13.43%AO is a gas ( 9 voters )
55.22%BO is a gas ( 37 voters )
8.96%A will reduce BO above temperture T1 ( 6 voters )
22.39%B will reduce AO below temperature T1 ( 15 voters )

Based On 67 Votes

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A will reduce BO below T1 and B will reduce AO above T1 . At higher temperature gases have lower free energy, hence BO should be gas.

A will reduce BO below T1 and B will reduce AO above T1 . At higher temperature gases have lower free energy, hence BO should be gas.

See lessWith reference to Ellingham diagram and concept BO is a gas

With reference to Ellingham diagram and concept BO is a gas

See lessAccording to ellingham diagram option B is right

According to ellingham diagram option B is right

See lessOption B according to Ellingham diagram

Option B according to Ellingham diagram

See lessCorrect answer is option B. The slope of the ellingham diagram is -(delta)S. And we know that, entropy is proportional to gaseous species. BO must be a gaseous species then only its slope will be negative.

Correct answer is option B.

The slope of the ellingham diagram is -(delta)S.

See lessAnd we know that, entropy is proportional to gaseous species. BO must be a gaseous species then only its slope will be negative.