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

Account for the following: 

Zn, Cd and Hg are soft metals.

Account for the following:

Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.

 How would you account the following :

 Transition metals and their compounds show catalytic properties.

How do you prepare:

K₂MnO₄ from MnO₂?

Define the following with a suitable example, of each: 
Multimolecular colloid

 Define the following with a suitable example, of each: 
 Gel

Write the structures of monomers used the following polymers:
Glyptal

Name an element of lanthanoid series which is well knwon to shown +4 oxidation state. Is it a strong oxidising agent or reducing agent? 

What is lanthanoid contraction? Write the.............

Account for the following : 
t-butyl chloride on heating with sodium methoxide gives 2-methylpropene instead of t-butyl methyl ether.

What is lanthanoid contraction?

Williamson's synthesis of preparing dimethyl ether is a/an ____________.

The f-block elements are known as ____________.

The reaction \[\ce{RX + 2Na + RX -> R - R + 2NaX}\] is called ____________.

Which one of the statements given below concerning properties of solutions, describes a colligative effect?

12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water. The lowering of vapour pressure of first case is ____________.

Chlorobenzene is prepared commercially by:

Which of the following cannot be made by using Williamson Synthesis:

Dehydration of alcohol to ethers is catalysed by:

The functional group which is found in amino acids is: