Problem 17
The number of moles of sodium hydroxide present in \(2.5 \mathrm{~L}\) and \(0.5 \mathrm{M}\) aqueous solution will be (a) \(1.25\) (b) \(0.5\) (c) \(12.5\) (d) 5
Problem 18
Highest boiling point is found in (a) \(0.1 \mathrm{M}\) Sucrose (b) \(0.1 \mathrm{M} \mathrm{BaCl}_{2}\) (c) \(0.1 \mathrm{M} \mathrm{NaCl}\) (d) \(0.1 \mathrm{M} \mathrm{KCl}\)
Problem 19
Maximum freezing point will be for 1 molal solution of, assuming equal ionization in each case: (a) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}\) (b) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2} \cdot \mathrm{H}_{2} \mathrm{O}\) (c) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl} .2 \mathrm{H}_{2} \mathrm{O}\) (d) \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3} \mathrm{Cl}_{3}\right] \cdot 3 \mathrm{H}_{2} \mathrm{O}^{2}\)
Problem 20
The solution which has the lowest freezing point is (a) \(0.1 \mathrm{M}\) potassium nitrate (b) \(0.1 \mathrm{M}\) aluminium sulphate (c) \(0.1 \mathrm{M}\) potassium chloride (d) \(0.1 \mathrm{M}\) potassium sulphate
Problem 21
The vant Hoff factor 'i' accounts for (a) the extent of dissociation of solute (b) the extent of dissolution of solute (c) the degree of decomposition of solution (d) degree of solubilization of solute
Problem 22
The azeotropic mixture of water and ethonal boils at \(78.15^{\circ} \mathrm{C}\). When this mixture is distilled, it is possible to obtain (a) pure \(\mathrm{H}_{2} \mathrm{O}\) (b) pure \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) (c) pure \(\mathrm{H}_{2} \mathrm{O}\) as well as pure \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) (d) neither \(\mathrm{H}_{2} \mathrm{O}\) nor \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) in their pure state
Problem 23
The solution of sugar in water contains (a) free ions (b) free atoms (c) free molecules (d) free atoms and molecules
Problem 24
Which of the following changes with change in temperature? (a) mole fraction (b) formality (c) \(\%(\mathrm{w} / \mathrm{W})\) (d) molality
Problem 25
When the solute is present in trace quantities the following expression is used (a) gram per million (b) nanogram per cent (c) microgram per cent (d) parts per million
Problem 27
Increasing the temperature of an aqueous solution will cause (a) decrease in molality (b) decrease in molarity (c) decrease in mole fraction (d) decrease in \% (w/w)
