Chemistry

Which of the following binary mixtures will have same composition in liquid and vapour phase?

(i) Benzene-Toluene

(ii) Water-Nitric acid

(iii) Water-Ethanol

(iv) n-Hexane-n-Heptane

Isotonic solutions must have the same_____________.

(i) Solute

(ii) Density

(iii) Elevation in boiling point

(iv) Depression in freezing point

Van’t Hoff factor i is given by the expression _____________.

(i) i= $\mathit{}\frac{\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}{\mathbf{a}\mathbf{b}\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}$

(ii) i= $\mathit{}\frac{\mathbf{a}\mathbf{b}\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}{\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}$

(iii) i= $\mathit{}\frac{\mathbf{o}\mathbf{b}\mathbf{s}\mathbf{e}\mathbf{r}\mathbf{v}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}{\mathbf{c}\mathbf{a}\mathbf{l}\mathbf{c}\mathbf{u}\mathbf{l}\mathbf{a}\mathbf{t}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}$

(iv) i= $\frac{\mathbf{c}\mathbf{a}\mathbf{l}\mathbf{c}\mathbf{u}\mathbf{l}\mathbf{a}\mathbf{t}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}{\mathbf{o}\mathbf{b}\mathbf{s}\mathbf{e}\mathbf{r}\mathbf{v}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}$

Intermolecular forces between two benzene molecules are nearly of same strength as those between  two toluene molecules. For a mixture of benzene and toluene, which of the following are not true?

(i) Δmix H= zero

(ii) Δmix V= zero

(iii) These will form minimum boiling azeotrope.

(iv) These will not form ideal solution.

Which of the following factor(s) affect the solubility of a gaseous solute in the fixed volume of liquid solvent?

(a) nature of solute  (b) temperature (c) pressure

(i) (a) and (c) at constant T

(ii) (a) and (b) at constant P

(iii) (b) and (c) only

(iv) (c) only

KH value for Ar(g), CO₂ (g), HCHO (g) and CH₄ (g) are 40.39, 1.67, 1.83*10^-5 and 0.413 respectively. Arrange these gases in the order of their increasing solubility.

(i) HCHO₄

(ii) HCHO₂< CH₄

(iii) Ar₂

(iv) Ar₄

KH value for Ar(g), CO₂ (g), HCHO (g) and CH₄ (g) are 40.39, 1.67, 1.83×10^-5 and 0.413 respectively. Arrange these gases in the order of their increasing solubility.

(i) HCHO4

(ii) HCHO2< CH4

(iii) Ar2

(iv) Ar4

4L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is _____________.

(i) 0.004

(ii) 0.008

(iii) 0.012

(iv) 0.016