Van’t Hoff Factor and its Significance NEET Questions

Physical Chemistry - Solutions

Van’t Hoff Factor and its Significance MCQ Questions


1.
The van't Hoff factor (i) was introduced to account for the deviation of solute behaviour from which type of laws?
A.
Hess's law of constant heat summation
B.
Colligative property laws (Raoult's law)
C.
Newton's laws of motion
D.
Gas laws for ideal gases only
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ANSWER :
B. Colligative property laws (Raoult's law)
2.
The van't Hoff factor (i) is defined as the ratio of the:
A.
Number of moles of solvent to number of moles of solute
B.
Normal (calculated) molar mass to the observed (experimental) molar mass of the solute
C.
Molar mass of solvent to molar mass of solute
D.
Observed molar mass to the normal molar mass of the solute
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ANSWER :
B. Normal (calculated) molar mass to the observed (experimental) molar mass of the solute
3.
The van't Hoff factor (i) can also be defined as the ratio of the:
A.
Volume of solution to volume of solvent
B.
Observed colligative property to the calculated (normal) colligative property
C.
Molar mass of solute to molar mass of solvent
D.
Calculated colligative property to the observed colligative property
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ANSWER :
B. Observed colligative property to the calculated (normal) colligative property
4.
The van't Hoff factor (i) can also be defined in terms of particle numbers as the ratio of the:
A.
Mass of solute to mass of solvent
B.
Number of moles of solvent to total moles in solution
C.
Total number of solute particles actually present in solution (after association/dissociation) to the number of formula units initially dissolved
D.
Number of solvent molecules to the number of solute particles
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ANSWER :
C. Total number of solute particles actually present in solution (after association/dissociation) to the number of formula units initially dissolved
5.
Who introduced the concept of the van't Hoff factor to explain the abnormal colligative properties of electrolyte solutions?
A.
Raoult
B.
Wilhelm Ostwald
C.
Jacobus van't Hoff
D.
Svante Arrhenius
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ANSWER :
C. Jacobus van't Hoff
6.
For a solute that does NOT undergo dissociation or association in solution (i.e., behaves normally, like glucose or urea), the value of the van't Hoff factor (i) is:
A.
Equal to zero
B.
Equal to 1
C.
Less than 1
D.
Greater than 1
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ANSWER :
B. Equal to 1