GATE MT 2021 Q6. Elements A and B have the same crystal structure. For a dilute solution of B in A, which one of the following is true? (Given: Dπ―πππ β Mixing enthalpy, aB β Activity of B and XB β Mole fraction of B)
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Answer:- Option D Hmix:- Enthalpy change during the formation of a binary solution of A & B Activity:- It is a measure of the effective or free concentration of a species under non-ideal conditions. Since it is given in the question that A & B have the same CRYSTAL STRUCTURE, which is the moRead more
Answer:- Option D
Hmix:- Enthalpy change during the formation of a binary solution of A & B
Activity:- It is a measure of the effective or free concentration of a species under non-ideal conditions.
Since it is given in the question that A & B have the same CRYSTAL STRUCTURE, which is the most important criteria for extensive solid solubility according to HUME-ROTHERY RULES this implies that there will be an attraction between A & B so Hmixing will be<0Β
Now, from RAOULT’S LAW, we have,
Activity= Activity coefficient *Β Mole fraction(X)
Since there is an attraction between A & B,
ACTIVITY COEFFICIENT will be< 1
This implies (Activity) of A will be< (Mole fraction) of A
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