Trying to find the right answer to this..

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.

CBSE Class 12 Chemistry Solved Question Paper 2018

Short Answer Type

11.

Give reasons for the following:

Aquatic animals are more comfortable in the cold water than in warm water.

12.

Give reasons for the following:

Elevation of the boiling point of 1 M KCl solution is nearly double than that of 1 M sugar solution.

13.

Write the formula of the following coordination compound :
Iron(III) hexacyanoferrate (II)

14.

What type of isomerism is exhibited by the complex [Co(NH₃)₅ Cl]SO₄?

15.

Write the hybridisation and number of unpaired electrons in the complex [CoF₆]^3-.

Atomic No. of Co = 27

16.

Identify the chiral molecule in the following pair :

17.

Give reason:

E° value for a Mn³⁺/Mn²⁺ couple is much more positive than that for Fe3⁺/Fe²⁺.

18.
Give reason:
Iron has a higher enthalpy of atomization than that of copper.

Transition metal has the high heat of atomisation due to the presence of strong metallic bond which arises due to the presence of an unpaired electron in the (n - 1) d subshell. This is because the atoms in these elements are closely packed and held together by strong metallic bonds. The metallic bond is formed as a result of the interaction of electrons in the outermost shell. Greater the number of valence electrons, stronger is the metallic bond.