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

How do you convert the following:

Acetic acid to Methane

Write the equations involved in the following reactions :

Stephen reaction

Write the equations involved in the following reactions :

Wolff-Kishner reduction

What is the difference between acidic amino acids and basic amino acids?

Indicate the principle behind the method used for the refining of Nickel.

Complete the following equation :

Illustrate the following reactions giving suitable example in each case 

Acetylation of amines

An element with density 11.2 g cm^–3 forms a f.c.c. lattice with edge length of 4 × 10^–8 cm.
Calculate the atomic mass of the element.
(Given : N_A = 6.022 × 10²³ mol^–1)

Outline the principles behind the refining of metals by the following methods:

Zone refining method

Outline the principles behind the refining of metals by the following methods:

Chromatographic method

Complete the following chemical equations :

Cu + H₂SO₄(conc.) →

Name a member of the lanthanoid series that is well-known to exhibit +2 oxidation state.

Write the principle behind the following methods of refining:

Vapour-phase refining

How will you convert the following?

Aniline into N−phenylethanamide

Write down the reaction taking place in blast furnace related to the metallurgy of iron in the temperature rnge 500 K – 800 K. What is the role of limestone in the metallurgy of iron? 

What happens when Silver is leached with NaCN in the presence of air? 

What happens when Copper matte is charged into silica lined converter and hot air blast is blown? 

What happens when NaCN is added in an ore containing PbS and ZnS during concentration by froth floatation method? 

 Write the electronic configuration of Fe(III) on the basis of crystal field theory when it forms an octahedral complex in the presence of (i) strong field, and (ii) weak field ligand. (Atomic no.of Fe=26) 

Differentiable between the following: 
Essential amino acids Non-essential amino acids