Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A: Helium is used to dilute oxygen in diving apparatus.
Reason R: Helium has high solubility in O₂
In the light of the above statements, choose the correct answer from the options given below:

Which of the following aqueous solution will exhibit highest boiling point?

Match List - I with List - II

Choose the correct answer from the options given below :

5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively, Which of the following is true regarding the described solution?

The plot of osmotic pressure (\(\pi\)) vs concentration (\(\text{mol L}^{-1}\)) for a solution gives a straight line with slope \(25.73\,\text{L bar mol}^{-1}\). The temperature at which the osmotic pressure measurement is done is
(Use \(\text{R}\,=\, 0.083\,\text{L bar mol}^{-1}\text{K}^{-1}\))

The Henry's law constant \(\left(\text{K}_\text{H}\right)\) values of three gases (A, B, C) in water are \(145\), \(2 \times 10^{-5}\) and \(35\) kbar, respectively. The solubility of these gases in water follow the order:

The following solutions were prepared by dissolving 10 g of glucose (C₆H₁₂O₆) in 250 ml of water (P₁), 10 gof urea (CH₄N₂O) in 250 ml of water (P₂) and 10 g of sucrose (C₁₂H₂₂O₁₁) in 250 ml of water (P₃). The right option for the decreasing order of osmotic pressure of these solutions is :

The correct option for the value of vapour pressure of a solution at 45^°C with benzene to octane in molar ratio 3: 2 is :
[At 45°C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg, Assume Ideal gas]

The mixture which shows positive deviation from Raoult's law is:

Find out the solubility of Ni(OH)₂ in 0.1 M NaOH. Given that the ionic product of Ni(OH)₂ is 2 x 10_-15

The freezing point depression constant (K_f) of benzene is 5.12 K kg mol^-1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is
(rounded off up to two decimal places):

HCl was passed through a solution of CaCI₂, MgCi₂ and NaCI. Which of the following compound(s) crystallise(s)?

The mixture that forms maximum boiling azeotrope is

For an ideal solution, the correct option is

For a given reaction, \(\Delta \text{H}\) = 35.5 kJ mol^–1 and \(\Delta \text{S}\) = 83.6 JK^–1 mol^–1. The reaction is spontaneous at :
[Assume that \(\Delta \text{H}\) and \(\Delta \text{S}\) do not vary with temperature]

If molality of the dilute solution is doubled, the value of molal depression constant (K_f ) will be

Which of the following is dependent on temperature ?

At 100°C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If K_b = 0.52, the boiling point of this solution will be

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct ? Assume that the temperature is constant at 25 ° C.
( Given , vapour pressure data at 25 ° C , benzene = 12.8 kPa , toluene = 3.85 kPa )