List of top Chemistry Questions on Solutions asked in CBSE CLASS XII, CBSE Compartment XII

Explain with the help of Henry's law: (i) Bends (ii) Anoxia
A solution is prepared by dissolving 0.025 g of potassium sulphate in 2 L of water at 27$^\circ$C. Assuming potassium sulphate is completely dissociated, determine its osmotic pressure. Given: \[ R=0.082 \, L\,atm\,K^{-1}mol^{-1} \] \[ \text{Molar mass of }K_2SO_4=174\,g\,mol^{-1} \] (ii) What type of azeotrope will be formed by a solution of acetone and chloroform? Give reason.
The mole fraction of a solute in 2.0 molal aqueous solution is :
What type of deviation from Raoult's law is shown by a mixture of phenol and aniline? Give reason.
What will happen to the boiling point of the solution on mixing phenol and aniline?
Assertion (A): It is not possible to separate the components of an azeotrope by fractional distillation.
Reason (R): Components of an azeotrope have the same composition in liquid and vapour phase and boil at a constant temperature.
The mole fraction of a solute in 2.0 molal aqueous solution is :
State Henry’s law. Calculate the mole fraction of CO\(_2\) in water at 298 K under 700 mm Hg pressure. (Given: Henry’s constant for CO\(_2\) in water at 298 K = \( 1.25 \times 10^6 \) mm Hg)
Calculate the boiling point of a solution containing 0.61 g of benzoic acid (122 \( g mol^{-1} \)) in 5 g of \( CS_2 \) in which it dimerises to 88%. \( T_b^\circ(CS_2) = 46.2^\circ C, K_b = 2.3 K kg mol^{-1} \).
What type of deviation from Raoult’s law is shown by mixture of ethanol and acetone? Give reason. What will happen to the boiling point of the solution on mixing ethanol and acetone?
Assertion (A) : Components of azeotropes are easily separated by fractional distillation.
Reason (R) : Components of an azeotrope have same composition in liquid and vapour phase.
Which of the following solutions will have the highest osmotic pressure?
What type of azeotrope will be formed by a solution of benzene and chloroform? Give reason.
A solution is prepared by dissolving 0.088 g of potassium sulphate in 2 L of water at 27\(^\circ\)C. Assuming complete dissociation, determine its osmotic pressure. (Given: \(R = 0.082 \, L\,atm\,K^{-1}\,mol^{-1}\), Molar mass of K\(_2\)SO\(_4\) = 174 g mol\(^{-1}\))
Write two differences between ideal and non-ideal solutions.
Calculate the freezing point of a solution when \(10.5\) g of MgBr\(_2\) was dissolved in 250 g of water, assuming MgBr\(_2\) undergoes complete dissociation. (Given: Molar mass of MgBr\(_2\) = 184 g mol\(^{-1}\), \(K_f\) for water = 1.86 K kg mol\(^{-1}\))
1.00 molal aqueous solution of trichloroacetic acid is heated to its boiling point. The boiling point of this solution was found to be 100.18\(^\circ\)C. Calculate the Van’t Hoff factor for trichloroacetic acid. (Given: \( K_b \) for water = 0.512 K kg mol\(^{-1}\))
We cannot measure the resistance of an ionic solution using DC because:
In case of association, abnormal molar mass of solute will:
An aqueous solution of NaOH was made and its molar mass from the measurement of osmotic pressure at 27°C was found to be 25 g mol$^{-1$.}
Calculate the percentage dissociation of NaOH in this solution.
Give reasons:
(a) Cooking is faster in a pressure cooker than in an open pan.
(b) On mixing liquid X and liquid Y, volume of the resulting solution decreases. What type of deviation from Raoult's law is shown by the resulting solution? What change in temperature would you observe after mixing liquids X and Y?
0.3 g of acetic acid (Molar mass = 60 g mol\(^{-1}\)) dissolved in 30 g of benzene shows a depression in freezing point equal to 0.45°C. Calculate the percentage association of acid if it forms a dimer in the solution.
(Given: \( K_f \) for benzene = 5.12 K kg mol\(^{-1}\))
Define Azeotrope. What type of Azeotrope is formed by negative deviation from Raoult's law? Give an example.
On mixing 30 mL of acetone with 20 mL of chloroform, the total volume of solution is:
Which of the following solutions will have the highest boiling point in water?