If a binary system exihibits a miscibility gap in the solid state, then the enthalpy of mixing in the solid state, ΔHmix should necessarily be

In a binary system A-B, ε_AA, ε_BB and ε_AB correspond to A-A, B-B and A-B bond energies respectively. The miscibility gap will occur, if

A

$${\varepsilon _{AB}}$$

B

$${\varepsilon _{AB}}

C

$${\varepsilon _{AB}} = \frac{1}{2}\left( {{\varepsilon _{AA}} + {\varepsilon _{BB}}} \right)$$

D

$${\varepsilon _{AB}}

The limiting condition for the appearance of the miscibility gap in a binary solution is
Where, G is the Gibbs free energy and X is the mole fraction of component Z.

A

$$\left( {\frac{{{\partial ^2}G}}{{\partial {X^2}}}} \right) = 0$$

B

$$\left( {\frac{{{\partial ^3}G}}{{\partial {X^3}}}} \right) = 0$$

C

$$\left( {\frac{{{\partial ^2}G}}{{\partial {X^2}}}} \right) + \left( {\frac{{{\partial ^3}G}}{{\partial {X_3}}}} \right) = 0$$

D

$$\left( {\frac{{{\partial ^2}G}}{{\partial {X^2}}}} \right) - \left( {\frac{{{\partial ^3}G}}{{\partial {X^3}}}} \right) = 0$$

What is the enthalpy change of a reaction at 45oC, if the enthalpy of reactant at 45oC and 25oC are 10 J and 6 J, and enthalpy of product at 45oC and 25oC are 15 J and 8 J, and the enthalpy change of reaction at 25oC is 10 J?

A

14 J

B

21 J

C

27 J

What is the enthalpy change of a reaction at 35oC, if the enthalpy of reactant at 35oC and 25oC are 18 J and 10 J, and enthalpy of product at 35oC and 25oC are 12 J and 8 J, and the enthalpy change of reaction at 25oC is 15 J?

A

9 J

B

14 J

C

22 J

What is the enthalpy change of a reaction at 35oC, if the enthalpy of reactant at 35oC and 25oC are 22 J and 15 J, and enthalpy of product at 35oC and 25oC are 10 J and 5 J, and the enthalpy change of reaction at 25oC is 36 J?

A

12 J

B

24 J

C

36 J

What is the enthalpy change of a reaction at 30oC, if the enthalpy of reactant at 30oC and 25oC are 18 J and 15 J, and enthalpy of product at 30oC and 25oC are 10 J and 8 J, and the enthalpy change of reaction at 25oC is 45 J?

A

10 J

B

25 J

C

50 J

What is the enthalpy change of a reaction at 90oC, if the enthalpy of reactant at 90oC and 25oC are 60 J and 25 J, and enthalpy of product at 90oC and 25oC are 80 J and 10 J, and the enthalpy change of reaction at 25oC is 5 J?

A

10 J

B

50 J

C

110 J

What is the enthalpy of a mixture having 20% of A with enthalpy 20 J, 30% of B with enthalpy 40 J, and 50% of C with enthalpy 20 J?

A

26 J

B

29 J

C

31 J

What is the enthalpy of a mixture having 10% of A with enthalpy 10 J, 30% of B with enthalpy 30 J, and 60% of C with enthalpy 25 J?

A

21 J

B

25 J

C

27 J

What is the final enthalpy of the solution made by mixing 100 grams of 10% NaOH having enthalpy 40 J with 300 grams of 90% NaOH having enthalpy 20 J?

A

10 J

B

15 J

C

25 J

If a binary system exihibits a miscibility gap in the solid state, then the enthalpy of mixing in the solid state, ΔH^mix should necessarily be

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