2.5 g of protein containing only glycine (C₂H₅NO₂) is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5.03 $\times$ 10^$-$3 bar. The total number of glycine units present in the protein is ____________.

(Given : R = 0.083 L bar K^$-$1 mol^$-$1)

The elevation in boiling point for 1 molal solution of non-volatile solute A is $3 \mathrm{~K}$. The depression in freezing point for 2 molal solution of $\mathrm{A}$ in the same solvent is 6 $K$. The ratio of and i.e., is . The value of is [nearest integer]

A 0.5 percent solution of potassium chloride was found to freeze at $-$0.24$^\circ$C. The percentage dissociation of potassium chloride is ______________. (Nearest integer)

Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/are ___________.

A. $1 ~\mathrm{M}$ aq. $\mathrm{NaCl}$ and $2 ~\mathrm{M}$ aq. urea

A company dissolves 'x' amount of CO₂ at 298 K in 1 litre of water to prepare soda water. X = __________ $\times$ 10^$-$3 g. (nearest integer)

(Given : partial pressure of CO₂ at 298 K = 0.835 bar.

Henry's law constant for CO₂ at 298 K = 1.67 kbar.

Atomic mass of H, C and O is 1, 12, and 6 g mol^$-$1, respectively)

A solution containing 2.5 $\times$ 10^$-$3 kg of a solute dissolved in 75 $\times$ 10 kg of water boils at 373.535 K. The molar mass of the solute is ____________ g mol. [nearest integer] (Given : K(HO) = 0.52 K kg mol and boiling point of water = 373.15 K)

The vapor pressure of pure benzene and methyl benzene at $27^{\circ} \mathrm{C}$ is given as 80 Torr and 24 Torr, respectively. The mole fraction of methyl benzene in vapor phase, in equilibrium with an equimolar mixture of those two liquids (ideal solution) at the same temperature is _________ $\times 10^{-2}$ (nearest integer)