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

Out of PbS and PbCO₃ (ores of lead), which one is concentrated by froth floatation process preferably?

Why are low spin tetrahedral complexes rarely observed?

Complete the following equations:

`2MnO_4^(-)+16H^++5S^(2-)rarr`

CO (g) and H₂ (g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?

How do you convert toluene to benzoic acid?

How do you convert the following :

 Ethyne to Ethanal

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