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.
Reasons R: Helium has high solubility in O_₂ In the light of the above statements, choose the correct answer from the options given below :

Consider the following statements regarding osmotic pressure:
(A) Molar mass of a protein can be determined using osmotic pressure method.
(B) The osmotic pressure is proportional to the molarity.
(C) Reverse osmosis occurs when a pressure larger than osmotic pressure is applied to the colloidal solution side.
(D) Edema occurs due to retention of water in tissue cells as a result of osmosis.
Choose the correct statements with reference to osmotic pressure:

Vapour pressures of pure liquids 'A' and 'D' at 50°C are 500 mm Hg and 800 mm Hg respective binary solution of 'A' and 'D' boils at 50°C and 700 mm Hg pressure. The mole percentage of solution is:

A molecule X associates in a given solvent as per the following equation:

For a given concentration of X, the van't Hoff Factor was found to be 0.80 and the fraction of associated molecules was 0.3. The correct value of 'n' is: 0 associated

The gold number range of some of the lyophilic colloids is given below :
A: 0.005 0.01, B: 0.15-0.25, C: 0.04- 1.0 and D: 15-25.
Which among these can be used as a better protective colloid?

Aashi, by mistake used an unknown solution to clean her clothes, in place of detergent. Her clothes faded. The solution could be:

A liquid compound ( x ) can be purified by steam distillation only if it is

Isotonic solutions have same

The Henry’s law constant values of three gases (A, B, C) in water are and 35 kbar, respectively. The solubility of these gases in water follow the order: