Liquid Solution - Physical Chemistry - Chemistry Previous Year Questions

Solution '\(A\)' contains acetone dissolved in chloroform and solution '\(B\)' contains acetone dissolved in carbon disulphide. The type of deviations from Raoult's law shown by solutions \(A\) and \(B\), respectively are

A non-volatile solute, '\(A\)' tetramerises in water to the extent of \(80 \%.\) \(2 .5 \mathrm{~g}\) of '\(A\)' in \(100 \mathrm{~g}\) of water, lower the freezing point by \(0.3^{\circ} \mathrm{C}\). The molar mass of '\(A\)' in \(\mathrm{g}\) is \(\left(K_f\right.\) for water \(=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1})\)

Relative lowering of vapour pressure of a dilute solution of glucose dissolved in \(1 \mathrm{~kg}\) of water is 0.002 . The molality of the solution is

Which of the following pair of solutions is isotonic?

Solute '\(X\)' dimerises in water to the extent of \(80\%\). 2.5g of '\(X\)' in \(100 \mathrm{~g}\) of water increases the boiling point by \(0.3^{\circ} \mathrm{C}\). The molar mass of 'X' is \([K_b=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}]\)

The \(K_{\mathrm{H}}\) value (\(\mathrm{K}\) bar) of argon (I), carbondioxide (II), formaldehyde (III) and methane (IV) are respectively \(40.3,167, 1.83 \times 0^{-5}\) and 0.413 at \(298 \mathrm{~K}\). The increasing order of solubility of gas in liquid is

Choose the correct statement.

Henry's law constant for the solubility of \(\mathrm{N}_2\) gas in water at \(298 \mathrm{~K}\) is \(1.0 \times 10^5 \mathrm{~atm}\). The mole fraction of \(\mathrm{N}_2\) in air is 0.8 . The number of moles of \(\mathrm{N}_2\) from air dissolved in 10 moles of water at \(298 \mathrm{~K}\) and \(5 \mathrm{~atm}\) pressure is

The vapour pressure of pure liquids \(A\) and \(B\) are 450 and \(700 \mathrm{~mm}\) of \(\mathrm{Hg}\) at \(350 \mathrm{~K}\) respectively. If the total vapour pressure of the mixture is \(600 \mathrm{~mm}\) of \(\mathrm{Hg}\), the composition of the mixture in the solution is

Solubility of a gas in a liquid increases with

Which of the following colligative properties can provide molar mass of proteins, polymers and colloids with greater precision?

The rise in boiling point of a solution containing \(1.8 \mathrm{~g}\) of glucose in \(100 \mathrm{~g}\) of solvent is \(0.1^{\circ} \mathrm{C}\). The molal elevation constant of the liquid is

If \(3 \mathrm{~g}\) of glucose (molar mass \(=180 \mathrm{~g}\)) is dissolved in \(60 \mathrm{~g}\) of water at \(15^{\circ} \mathrm{C}\), the osmotic pressure of the solution will be

A sample of water is found to contain \(5.85 \%\) \(\left(\frac{w}{w}\right)\) of \(A B\) (molecular mass 58.5 ) and \(9.50 \%\) \(\left(\frac{w}{w}\right) X Y_2\) (molecular mass 95). Assuming \(80 \%\) ionisation of \(A B\) and \(60 \%\) ionisation of \(X Y_2\), the freezing point of water sample is [Given, \(K_f\) for water \(1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\), Freezing point of pure water is \(273 \mathrm{~K}\) and \(A, B\) and \(Y\) are monovalent ions.]

The swelling in feet and ankles of an aged person due to sitting continuously for long hours during travel, is reduced by soaking the feet in warm salt water. This is because of