Define azeotropes. What type of azeotrope is formed by positive deviation from Raoult’s law ?
Give an example.
Give an example.
Azeotropes—A liquid mixture which distills a constant temperature without undergoing any change in composition is called azeotropes.
Minimum boiling azeotropes is formed by positive deviation from Raoult’s law.
Example : (i) Water and benzene
(ii) Chloroform and methanol
Minimum boiling azeotropes is formed by positive deviation from Raoult’s law.
Example : (i) Water and benzene
(ii) Chloroform and methanol
State Henry’s law. What is the effect of temperature on the solubility of a gas in a liquid ?
Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with oxalic acid ?
Write the ionic equations for the reactions.
Explain why :
(i) E° for Mn³⁺/Mn²⁺ couple is more positive than that for Fe³⁺/Fe²⁺. (At. Nos. Mn = 25, Fe = 26).
(ii) Ce³⁺ can be easily oxidized to Ce⁴⁺. (At. No.Ce = 58).
Following reactions can occur at cathode during the electrolysis of aqueous silver nitrate solution using Pt electrodes:
Complete the following chemical equations :
(i) MnO₄⁻(aq) + S₂O₃²⁻(aq) + H₂O(l) →
(ii) Cr₂O₇²⁻(aq) + Fe²⁺(aq) + H⁺(aq) →
(i) State the law which helps to determine the limiting molar conductivity of weak electrolyte.
(ii) Calculate limiting molar conductivity of CaSO₄ (limiting molar conductivity of calcium and sulphate ions are 119.0 and 160.0 Scm² mol⁻¹ respectively)
(i) Gas (A) is more soluble in water than Gas (B) at the same temperature. Which one of the two gases will have the higher value of KH (Henry’s constant) and why ?
(ii) In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes ?