Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Write the mechanism of the following reaction:

Write the chemical equation for the reaction involved in Cannizzaro reaction.

What is the basicity of H₃PO₄?

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.