ASSIGNMENT PROBLEMS

Subjective:

Level – 0

1.Stability of a crystal is reflected in the magnitude of its melting point. Comment

2.The ions of NaF and MgO all have the same number of electrons and internuclear distances are about the same (235 pm and 215 pm), why then are the melting points of NaF and MgO, so different (992°C and 2642°C)?

3.What happens when Ferromagnetic or anti Ferromagnetic or a Ferrimagnetic solid is heated?

4.What is the difference between glass and Quartz while both are made up from SiO4tetrahedral?Under what conditions could Quartz be converted into glass?

5.Why common salt is sometimes yellow instead of being pure white?

6.Why is Frenkel defect not found in pure alkali metal halides?

7.Why the defects of the crystalline solids are called thermodynamic defects?

8.Why stoichiometric defects are also called instrinsic defects?

9.What is radius ratio? What is its significance?

10.State the difference between Schottky and Frenkel defects? Which of these two changes the density of the solid?

11.The unit cube length of LiCl (NaCl structure) is 5.14A°. Assuming anion-anion contact, calculate the ionic radius of Cl- ion.

12.Ferric oxide crystallizes in a hexagonal close – packed array of oxide (O2–) ions with two out of every three octahedral holes occupied by iron ions. What is the formula of ferric oxide?

13. A metal crystallises into two cubic phases, face – centered cubic (fcc) and body – centred cubic (bcc), whose unit cell lengths are 3.5 and 3.0respectively. Calculate the ratio of density of fcc and bcc.                                                                                 

14.The edge length of a cubic unit cell of an element (atomic mass=95.54) is 313 pm and its density is 10.3 g/ml calculate the atomic radius.   

15.Xenon crystallizes in face centre cubic lattice and the edge of the unit cell is 620 pm, then calculate the radius of Xenon-atom.

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