Define the following terms:
(i) Abnormal molar mass
(ii) van’t Hoff factor
(i) Abnormal molar mass
(ii) van’t Hoff factor
(i) If the molar mass calculated by using any of the colligative properties to be different than theoretically expected molar mass.
(ii) Extent of dissociation or association or ratio of the observed colligative property to calculated colligative property.
(ii) Extent of dissociation or association or ratio of the observed colligative property to calculated colligative property.
Define the following terms :
(i) Mole fraction
(ii) Isotonic solutions
(iii) Van’t Hoff factor
(iv) Ideal solution
What is meant by rate of a reaction ? Differentiate between average rate and instantaneous rate of a reaction.
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).
Define the following terms :
(i) Fuel cell
(ii) Limiting molar conductivity
Calculate pH of following half-cell. Pt, \(H_2\) / \(H_2\)\(SO_4\) , if its electrode potential is 0.03V.
What is meant by positive deviations from Raoult’s law ? Give an example. What is the sign of H for positive deviation ?
(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)
In the following ions:
Mn³⁺, V³⁺, Cr³⁺, Ti⁴⁺
(Atomic no: Mn = 25, V = 23, Cr = 24, Ti = 22)
(a) Which ion is most stable in an aqueous solution?
(b) Which ion is the strongest oxidizing agent?
(c) Which ion is colourless?
(d) Which ion has the highest number of unpaired electrons?