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

Write one difference between O/W emulsion and W/O emulsion

Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.

Write the product(s) in the following reactions

Give simple chemical tests to distinguish between the following pairs of compounds :

Propanol and 2-methylpropan-2-ol

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 following term: 

Colligative properties

Write one difference between α-helix and β-pleated structures of proteins.

Name the reagents used in the following reactions:

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 :