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

Define lanthanoid contraction.

Explain the mechanism of the following reaction:

What type of point defect is produced when AgCl is doped with CdCl₂?

Write the major products(s) in the following:

Why carboxylic acid does not give reactions of carbonyl group?

Define electrochemical cell

Why does the cell potential of mercury cell remain constant throughout its life?

From the given cells:

Lead storage cell, Mercury cell, Fuel cell and Dry cell

Answer the following:

(i) Which cell is used in hearing aids?

(ii) Which cell was used in Apollo Space Programme?

(iii) Which cell is used in automobiles and inverters?

(iv) Which cell does not have long life?

How do you convert the following :
Phenol to anisole

Define the following term:

Schottky defect

What type of battery is mercury cell? Why is it more advantageous than dry cell?

Account for the following :

Zr and Hf have almost similar atomic radii.

What type of non-stoichiometric point defect is responsible for the pink colour of LiCl ?

What type of stoichiometric defect is shown by NaCl ?

Write the equations involved in the following reactions : Williamson synthesis

Name the type of cell which was used in Apollo space programme for providing electrical power.

Define the following term as related to proteins:

Primary structure

Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.

Which stoichiometric defect does not change the density of the crystal?

Define terms: Fuel cell