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

Give two examples of macromolecules that are chosen as drug targets

Account for the following:

Mn²⁺ is more stable than Fe²⁺ towards oxidation to +3 state.

Name the elements of 3d transition series that show maximum number of oxidation states. Why does this happen?

Which transition metal of 3d series has positive E° (M²⁺/M) value and why?

Out of Cr³⁺ and Mn³⁺, which is a stronger oxidising agent and why?

Write the principle behind the following methods of refining:

Hydraulic washing

Define the following term:

Pseudo first-order reaction

Define the following terms:

Half-life period of reaction (t_1/2).

 What is the difference between agonists and antagonists? 

Write structures of compounds A and B of the following reaction : 

Write structures of compounds A and B of the following reaction : 

complete the following reaction:

\[\ce{(C6H5CH2)2Cd + 2CH3COCl}\]

Write a chemical reaction to show that the open structure of D-glucose contains the following : 

 Straight chain 

Account for the following : 

o-nitrophenol is more steam volatile than p-nitrophenol.  

Arrange the following:

In increasing order of solubility in water:

C₆H₅NH₂, (C₂H₅)₂NH, C₂H₅NH₂

Which among the following is not true for crystalline solid?

Which among the following is an example of network solid?

Brass is an example of ____________.

Solid X is a very hard electrical insulator in solid as well as in molten state. It melts at extremely high temperature. Solid X is a ____________.

Nature of binding forces present in carbon dioxide molecules in solid state are ____________.