Van’t Hoff Factor and its Significance NEET Questions

Physical Chemistry - Solutions

Van’t Hoff Factor and its Significance MCQ Questions


13.
The modified equation for the relative lowering of vapour pressure, incorporating the van't Hoff factor, is given by:
A.
Δp/p° = x₂ / i
B.
Δp/p° = i × x₂ (where x₂ is the mole fraction of solute)
C.
Δp/p° = i + x₂
D.
Δp/p° = i − x₂
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ANSWER :
B. Δp/p° = i × x₂ (where x₂ is the mole fraction of solute)
14.
The modified equation for the elevation of boiling point, incorporating the van't Hoff factor, is given by:
A.
ΔTb = i Kb m
B.
ΔTb = Kb m / i
C.
ΔTb = i + Kb m
D.
ΔTb = Kb / (i m)
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ANSWER :
A. ΔTb = i Kb m
15.
The modified equation for the depression of freezing point, incorporating the van't Hoff factor, is given by:
A.
ΔTf = i + Kf m
B.
ΔTf = i Kf m
C.
ΔTf = Kf / (i m)
D.
ΔTf = Kf m / i
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ANSWER :
B. ΔTf = i Kf m
16.
The modified equation for osmotic pressure, incorporating the van't Hoff factor, is given by:
A.
π = i CRT
B.
π = C / (iRT)
C.
π = i + CRT
D.
π = CRT / i
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ANSWER :
A. π = i CRT
17.
If a solute dissociates in solution, the observed colligative property (such as osmotic pressure or boiling point elevation) compared to the value calculated assuming no dissociation will be:
A.
Greater than the calculated value
B.
Zero, regardless of concentration
C.
Less than the calculated value
D.
Exactly equal to the calculated value
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ANSWER :
A. Greater than the calculated value
18.
If a solute associates in solution, the observed colligative property compared to the value calculated assuming no association will be:
A.
Less than the calculated value
B.
Greater than the calculated value
C.
Infinite
D.
Exactly equal to the calculated value
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ANSWER :
A. Less than the calculated value