PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

Define limiting molar conductivity.

Why conductivity of an electrolyte solution decreases with the decrease in concentration ?

Write the mechanism of the following reaction :

The conductivity of 0.20 mol L⁻¹ solution of KCl is 2.48 × 10⁻² S cm⁻¹. Calculate its molar conductivity and degree of dissociation (α). Given λ⁰ (K⁺) = 73.5 S cm² mol⁻¹ and λ⁰ (C1⁻) = 76.5 S cm² mol⁻¹.

What is the basicity of H₃PO₃ ?

Why does the conductivity of a solution decrease with dilution?

Complete the following equations : P₄ + H₂O →

Write the mechanism of the following reaction :

Give reasons for the following : H₃PO₂ is a stronger reducing agent than H₃PO₃.

Write the chemical equations to illustrate the following name reaction: 

Cannizzaro’s reaction

Define the following terms: Molar conductivity (⋀_m)

Calculate the efficiency of packing in case of a metal crystal for body-centred cubic

Niobium crystallises in body-centred cubic structure. If density is 8.55 g cm⁻³, calculate atomic radius of niobium using its atomic mass 93 u.

The molar conductivity of 0.025 mol L⁻¹ methanoic acid is 46.1 S cm² mol⁻¹. Calculate its degree of dissociation and dissociation constant. Given \[\ce{λ^0_{(H^+)}}\] = 349.6 S cm² mol⁻¹ and \[\ce{λ^0_{(HCOO^-)}}\] = 54.6 S cm² mol⁻¹.

The conductivity of sodium chloride at 298 K has been determined at different concentrations and the results are given below:

Calculate ∧_m for all concentrations and draw a plot between ∧_m and c^1/2. Find the value of `Lambda_m^0`.

Conductivity of 0.00241 M acetic acid is 7.896 × 10⁻⁵ S cm⁻¹. Calculate its molar conductivity and if `Lambda_m^0` for acetic acid is 390.5 S cm² mol⁻¹, what is its dissociation constant?

Describe some features of catalysis by zeolites.

What is shape selective catalysis?

Copper can be extracted by hydrometallurgy but not zinc. Explain.

What is the role of cryolite in the metallurgy of aluminium?