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

How will you convert: Phenol to 2, 4, 6 − trinitrophenol?

Arrange the following in the increasing order of their pK_b values:

C₆H₅NH₂, C₂H₅NH₂, C₆H₅NHCH₃

Name the reagents used in the following reactions:

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

In reference to Freundlich adsorption isotherm, write the expression for adsorption of gases on solids in the form of an equation.

Give the structures of A, B and C in the following reactions :

Which component of starch is a branched polymer of α-glucose and insoluble in water?

Give the structures of A, B and C in the following reactions :

Give the structures of A, B and C in the following reactions :

Write the principles of the following methods :

Froth floatation method

Account for the following:
Gabriel phthalimide synthesis is not preferred for preparing aromatic primary amines.

 Write structures of compounds A and B in each of the following reactions:

Arrange the following polymers in increasing order of their intermolecular forces: 
Polyvinylchloride, Neoprene, Terylene

 Out of    _{and  , which one is optically active and why ?}

Give one chemical test as an evidence to show that [Co (NH₃)₅Cl]  are ionisation isomers. 

The decomposition of NH₃ on a platinum surface is a zero-order reaction. If the rate constant (k)  is 4 x 10^-3 ms^-1, how long will it take to reduce the initial concentration of NH₃ from 0.1 M to 0.064 M?

Write the structure of main compounds A and B in the following reaction:

\[\ce{CH3CH2CN->[CH3MgBRH/3O+]A->[LiAIH4]B}\]

Why dextro and laevo rotatory isomers of Butan-2-ol are difficult to separate by fractional distillation?

Write the name of gas released when Cu is added to
dilute HNO₃

Write the name of gas released when Cu is added to
conc. HNO₃