Abnormal Value of Molar Mass NEET Questions

Physical Chemistry - Solutions

Abnormal Value of Molar Mass MCQ Questions


1.
What is the term used to describe the phenomenon where the experimentally determined molar mass of a solute differs from its theoretically expected (normal) molar mass?
A.
Isotonic effect
B.
Abnormal molar mass
C.
Colligative deviation
D.
Osmotic anomaly
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ANSWER :
B. Abnormal molar mass
2.
Which factor, introduced by van't Hoff, is used to express the extent of dissociation or association of a solute in solution?
A.
Degree of ionization (ฮฑ)
B.
Activity coefficient (ฮณ)
C.
van't Hoff factor (i)
D.
Molal depression constant (Kf)
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ANSWER :
C. van't Hoff factor (i)
3.
How is the van't Hoff factor (i) mathematically defined in terms of molar masses?
A.
i = Observed colligative property / Calculated colligative property
B.
i = Normal molar mass / Abnormal (observed) molar mass
C.
i = Calculated colligative property / Observed colligative property
D.
i = Abnormal (observed) molar mass / Normal molar mass
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ANSWER :
B. i = Normal molar mass / Abnormal (observed) molar mass
4.
For a solute that undergoes dissociation into ions in solution, what is the expected value of the van't Hoff factor (i)?
A.
i is always equal to 1
B.
i is always less than 1
C.
i is greater than 1
D.
i is equal to zero
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ANSWER :
C. i is greater than 1
5.
For a solute that undergoes association (e.g., forms dimers) in solution, what is the expected value of the van't Hoff factor (i)?
A.
i is greater than 1
B.
i is less than 1
C.
i is always exactly 2
D.
i is equal to 1
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ANSWER :
B. i is less than 1
6.
What is the value of the van't Hoff factor (i) for a solute that neither dissociates nor associates in solution?
A.
i = 0
B.
i > 1
C.
i = 1
D.
i < 1
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ANSWER :
C. i = 1