What is meant by positive deviations from Raoult’s law ? Give an example. What is the sign of $\Delta_{\mathrm{mix}}$H for positive deviation ?

Why a mixture of Carbon disulphide and acetone shows positive deviation from Raoult’s law? What type of azeotrope is formed by this mixture?

(i) Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution : $\mathbf{Ag}^{+}(\mathbf{aq})+\mathbf{e}^{-}\rightarrow\mathbf{Ag}(\mathbf{s})\qquad\qquad\mathbf{E}^{\circ}$ = +0.80 V $\mathrm{H}^{+}(\mathrm{aq})+\mathrm{e}^{-}\rightarrow\frac{1}{2}\mathrm{H}_{2}(\mathrm{g})~~~~~~~~~\mathrm{E}^{\circ}$ = 0.00 V On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why ? (ii) Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration ?

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (i) an iodide (ii) H₂S.

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with oxalic acid ? Write the ionic equations for the reactions.

Following reactions can occur at cathode during the electrolysis of aqueous silver nitrate solution using Pt electrodes:

In a galvanic cell, the following cell reactions occurs: $\mathbf{Zn}(s)+2\mathbf{A}\mathbf{g}^{+}(\mathbf{a}\mathbf{q})\rightarrow\mathbf{Zn}^{2+}(\mathbf{a}\mathbf{q})+2\mathbf{A}\mathbf{g}(s)$ E°cell = +1.56 V (i) Is the direction of flow of electrons from zinc to silver or silver to zinc? (ii) How will concentration of Zn²⁺ ions and Ag⁺ ions be affected when the cell functions?

State Raoult’s law for a solution containing nonvolatile solute. What type of deviation from Raoult’s law is shown by a solution of chloroform and acetone and why?

State Raoult’s law for the solution containing volatile components. What is the similarity between Raoult’s law and Henry’s law ?