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

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.

Write the main products when

2, 4, 6-trinitrochlorobenzene is subjected to hydrolysis

Which one of the following is a polysaccharide:

Starch, Maltose, Fructose, Glucose

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

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

Write the structures of A, B, C, D and E in the following reactions:

What is the basicity of H₃PO₄?

Define limiting molar conductivity.

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

Predict the products of the following reactions :

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.

Write the structures of the main products when acetone (CH₃ − CO − CH₃) reacts with the following reagent :

Zn − Hg/conc. HCl

What is the basicity of H₃PO₃ ?

Why does the conductivity of a solution decrease with dilution?

Complete the following equations : P₄ + H₂O →

Write the equation involved in the following reaction:

Reimer-Tiemann reaction

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

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.