Q16 of 26 Page 1

Examine the given defective crystal:

Answer the following questions:


(i) Is the above defect stoichiometric or non-stoichiometric?


(ii) Write the term used for this type of defect. Give an example of the compound which shows this type of defect.


(iii) How does this defect affect the density of the crystal?


(i) The given defect is a Stoichiometric defect because the vacancy of the spaces in the ions does not change the stoichiometry of the crystal solid.

(ii) The term used for this defect is Schottky defect, which is a vacancy defect in ionic solids. e.g. NaCl, CsCl.


(iii) The presence of a large number of Schottky defects in a crystal will cause vacancies in the lattice and thus will lower its density.


More from this chapter

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14

(i) What type of isomerism is shown by the complex [Cr(H2O)6]Cl3?

(ii) On the basis of crystal field theory, write the electronic configuration for d4 ion if Δo > P.


(iii) Write the hybridization and shape of [CoF6]3.


(Atomic number of Co = 27).


 15

How can the following conversion be carried out:

(i) Aniline to bromobenzene


(ii) Chlorobenzene to 2-chloroacetophenone


(iii) Chloroethane to butane.


OR


What happens when


(i) chlorobenzene is treated with Cl2/FeCl3.


(ii) Ethyl choride is treated with AgNO2.


(iii) 2-bromopentane is treated with alcoholic KOH?


Write the chemical equations in support of your answer.


 17

Conductivity of 2.5 × 10-4 M methanoic acid is 5.25 × 10-5 S cm-1.

Calculate its molar conductivity and degree of dissociation.


Given:


λ(H+) = 349.5S cm2mole-1 and λ(HCOO-) = 50.5 Scm2mol-1


 18

Write any three differences between Physisorption and Chemisorption.