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

Write the final product(s) in each of the following reactions:

What is the role of sulphur in the vulcanisation of rubber?

The conductivity of 0.001 mol L-1 solution of CH₃COOH is 3.905× 10-5 S cm-1. Calculate its molar conductivity and degree of dissociation (α) Given λ°(H⁺)= 349.6 S cm² mol-1 and λ°(CH₃COO)= 40.9S cm²mol^-1.

Give reasons for the following:

o-nitrophenol is more acidic than o-methoxyphenol.

Draw the structures of the following: H₄P₂O₇ (Pyrophosphoric acid)

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