MEDIUM
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Which of the following graph represents correctly the variation in thermodynamic functions during th formation of a binary solution showing positive deviators from ideal behavior?

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Important Questions on General Principles and Processes of Isolation of Metals (Metallurgy)

HARD

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.

Reason R : The value of ΔGΘ becomes more on negative side as entropy is higher in liquid state than solid state.

In the light of the above statements. Choose the most appropriate answer from the options given below

MEDIUM

From the Ellingham diagram given below, identify the correct statements
I) Below 673 K CO can reduce FeO to Fe
II) Above 673 K Coke can reduce FeO to Fe
III CO is the strong reducing agent for the reduction of ZnO to Zn above 1073 K than coke
IV) Coke reducs ZnO to Zn readily at 1673 K

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EASY

The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates:

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MEDIUM

Given below are two statements.
Statement I: The choice of reducing agents for metals extraction can be made by using the Ellingham diagram, a plot of ΔG vs temperature.
Statement II: The value of ΔS increases from left to right in the Ellingham diagram.

In the light of the above statements, choose the most appropriate answer from the options given below:

EASY

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.

Reason R: CO tends to get decomposed at higher temperature.

In the light of the above statements, choose the correct answer from the options given below

EASY

For a reaction 4 Ms+nO2g2M2Ons

The free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which :

EASY

The reaction for obtaining the metal M from its oxide M2O3 ore is given by

M2O3s+2All Heat Al2O3l+2Ms

s=solid,l=liquid)  in that case, M is

MEDIUM

Given are two statements one is labelled as Assertion and other is labelled as Reason.

Assertion: Magnesium can reduce Al2O3 at a temperature below 1350 °C, while above 1350 °C aluminium can reduce MgO.

Reason: The melting and boiling points of magnesium are lower than those of aluminium.

In light of the above statements, choose most appropriate answer from the options given below

MEDIUM

Given below are two statements :

Statement I : According to the Ellingham diagram, any metal oxide with higher ΔG° is more stable than the one with lower ΔG°.

Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram.

In the light of the above statements, choose the most appropriate answer from the options given below

HARD

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: In the Ellingham diagram, a sharp change in slope of the line is observed from MgMgO at ~1120oC

Reason R: There is a large change of entropy associated with the change of state

In the light of the above statements, choose the correct answer from the options given below

HARD

Gibbs energy vs T plot for the formation of oxides is given below.

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For the given diagram, the correct statement is-

MEDIUM
The plot shows the variation of -lnKP Versus temperature for the two reactions.

Ms+12O2gMO(s) and

Cs+12O2gCO(s)

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Identify the correct statement: