Question 1 1 / -0
Which of the following is a colligative prope
Solution
Colligative property is dependent on no. of moles of solute. (Л=cRT)
Question 2 1 / -0
The rate at which a solid dissolves in liquid does not depend on
Solution
The rate at which a solid dissolves in liquid does not depend on pressure.
Question 3 1 / -0
How many grams of 2.0 M CH3 OH would have to be added to water to prepare 150 ml of its solution?
Question 4 1 / -0
Two solutions have different osmotic pressures. The solution of higher osmotic pressure is called
Solution
Hypertonic solutions are having high Osmotic Pressure.
Question 5 1 / -0
Which of the following colligative properties can provide molar masses of proteins (or polymers or colloids) with the greatest precision?
Question 6 1 / -0
Cryoscopic constant of a liquid is
Question 7 1 / -0
For a system containing two liquids X and Y, Raoult's law is obeyed when
Question 8 1 / -0
The expression relating mole fraction of solute in a solution with its molality is (where the various symbols have their usual meanings)
Question 9 1 / -0
Isotonic solutions have the same
Question 10 1 / -0
Suppose 52.5 ml of a solution contains 3.50 g of solute x in 50.0 g of water and the freezing point of the solution is – 0.86o C. Which of the following statements is not true?
Question 11 1 / -0
Directions:
Question 12 1 / -0
Which of the following properties represents a non-ideal solution?
Question 13 1 / -0
The volume of water to be added to 100 cm3 of 0.5 N H2 SO4 to get decinormal concentration is
Question 14 1 / -0
Directions:
Question 15 1 / -0
Directions:
Question 16 1 / -0
The relative lowering of vapour pressure of a dilute aqueous solution containing non-volatile solute is 0.0125. The molality of the solution is about
Question 17 1 / -0
Directions:
Question 18 1 / -0
The osmotic pressure of a dilute solution decreases when
Question 19 1 / -0
The van't Hoff factor for 0.1 M Ba(NO3 )2 is 2.35. What is the percentage dissociation of Ba(NO3 )2 ?
Question 20 1 / -0
At constant temperature the osmotic pressure of a solution is
Question 21 1 / -0
In which of the following cases is Henry's law valid?
Question 22 1 / -0
Ethylene dibromide (C2 H4 Br2 ) and 1,2-dibromopropane (C3 H6 Br2 ) form a series of ideal solutions over the whole range of compositions and at 85o C, the vapour pressures of these two pure liquids are 173 torr and 127 torr, respectively. If 10.0 g of ethylene bromide is dissolved in 80.0 g of 1,2-dibromopropane, then which of the following statements is correct?
Question 23 1 / -0
The rise in the boiling point of a solution containing 1.8 g of glucose in 100 g of solvent is 0.1o C. The molal elevation constant of the liquid is
Question 24 1 / -0
Directions:
Question 25 1 / -0
The van't Hoff factor of benzoic acid in benzene is found to be
Question 26 1 / -0
A liquid is kept in a closed vessel. If a glass plate (negligible mass) with a small hole is kept on top of the liquid surface, then the vapour pressure of the liquid in the vessel is :
Solution
Option (B) is correct. The vapour pressure of the liquid in the vessel is same as what would be if the glass plate were removed. Vapour pressure is characteristic property of a solvent at a temperature.
Question 27 1 / -0
Each pair forms ideal solution except :
Solution
Hint : The pair in which intermolecular forces have different natures usually show deviation from Raoult's law.
Correct Answer: Option D
Explanation :
We look for the option in which there is a difference in the nature of intermolecular forces.
We can see that in the options $$A$$ and $$B$$, the intermolecular forces have the same nature, i.e. dipole-dipole interaction.
In option $$C$$, they are both London forces.
But in option $$D$$, $$C_2H_5I$$ has dipole-dipole interaction, and $$C_2H_5OH$$ has H-bonding. So here the nature of intermolecular forces is different.
Hence, in the given options, only option $$D$$ does not follow the conditions for the ideal solution.
Final Answer : Hence, option $$D,\ C_2H_5I\ and \ C_2H_5OH$$ is the correct answer.
Question 28 1 / -0
On mixing 10 mL of carbon tetrachloride with 10 mL of benzene the total volume of the solution is :
Solution
On mixing 10 mL of carbon tetrachloride with 10 mL of benzene the total volume of the solution is 20 mL. As there is no changes in interparticle forces as both carbon tetrachloride and benzene are non-polar.
Question 29 1 / -0
Formation of a solution from two components can be considered as:
Solution
Solution so formed will be ideal if $$\Delta H_{soln.}=\Delta H_1+\Delta H_2+\Delta H_3$$
Question 30 1 / -0
A mixture of benzene and toluene forms :
Solution
Mixing of benzene and toluene does not involve any kind of decrease or increase in interaction forces in between molecules so they form ideal solution.
Question 31 1 / -0
Addition of which solute in 1.0 molar KI solution will not cause a change in vapour pressure:
Solution
Addition of $$I_2$$ in 1.0 molar KI solution will not cause a change in vapour pressure. No. of particles does not change in case of $$I_2$$
Question 32 1 / -0
The Van't Hoff factor of $$NaCl$$ assuming 100% dissociation is :
Solution
$$NaCl \rightarrow Na^+ + Cl^-$$
When NaCl dissociates completely, it gives two ions $$Na^+$$ and $$Cl^-$$.
Therefore, Van't Hoff factor is 2.
Hence, option $$B$$ is correct.
Question 33 1 / -0
The ratio of the value of any colligative property for KCl solution to that of sugar solution is:
Solution
An ionic compound will dissociate and covalent compounds will not dissociate.
$$KCl→K^++Cl^−$$
Colligative property depends on no of particles
KCl dissociates into 2 ions $$(Na^+, Cl^−)$$ but sugar has only one whole molecule.
So the ratio of the value of any colligative property for KCl solution to that for sugar solution of the same molality is nearly 2 times.
Hence option C is correct.
Question 34 1 / -0
Each pair forms ideal solution except :
Solution
Correct Answer: Option D
Explanation:
The solutions
which obey Raoult’s law over the entire range of concentration are known as
ideal solutions. The enthalpy of
mixing of the pure components to form the solution is zero and the volume of
mixing is also zero.
i.e. $$\Delta H_{mix} =0$$ and $$\Delta V_{mix} =0$$
That means ideal
solution is a mixture of solutions which have same intermolecular force of
attractions. In option, $$A, B,
C$$, the intermolecular forces are the same before and after the mixing. In option $$D$$,
the intermolecular forces are not the same because of hydrogen bonding between
alcohol molecules. Hence, it is not an ideal solution.
Therefore the
correct answer is option $$D$$.
Question 35 1 / -0
The Van't Hoff factor of very dilute solution of $$Ca{(N{O}_{3})}_{2}$$ is:
Solution
$$Ca{(N{O}_{3})}_{2}\longrightarrow {Ca}^{2+} + 2N{O}_{3}^{\ominus}$$
$$i=\displaystyle\cfrac{\text{Moles after dissociation}}{\text{Moles before dissociation}}=\cfrac{3}{1}$$
Hence, the correct option is $$\text{C}$$
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