Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Write the product(s) in the following reaction

Write the formula of reagents used in the following reactions :

Bromination of phenol to 2,4,6-tribromophenol

Write the formula of reagents used in the following reactions :

Hydroboration of propene and then oxidation to propanol.

Write one difference in Lyophobic sol and Lyophilic sol

Why a solution of [Ni(H₂O)₆]²⁺ is green while a solution of [Ni(CN)₄]²⁻ is colourless? (At. no. of Ni = 28)

Define the term Colligative properties

Write the structures of the main products in the following reactions :

 Describe Hinsberg method for the identification of primary, secondary and tertiary amines. Also write the chemical equations of the reactions involved.

Account for the following :

H₂S has lower boiling point than H₂O.

Account for the following :

H₂S has lower boiling point than H₂O.

Account for the following :

Iron on reaction with HCl forms FeCl₂ nd not FeCl₃.

Examine the given defective crystal:

Answer the following questions :
(i) What type of stoichiometric defect is shown by the crystal?
(ii) How is the density of the crystal affected by this defect?
(iii) What type of ionic substances show such defect?

Give one example each of sol and gel.

 Arrange the following increasing order of their boiling point:
CH₃CH₂OH, CH₃CHO, CH₃–O–CH₃ 

What type of defect is shown by NaCl in 
 stoichiometric defects, and

 non-stoichiometric defects?

Out of NaCl and AgCl, which one shows Frenkel defect and why? 

Arrange the following in increasing order of boiling points:

(CH₃)₃ N, C₂ H₅ OH, C₂ H₅ NH₂

Write the monomers of the following polymer : 

Answer the following question.
What type of stoichiometric defect is shown by ZnS and why?