3LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY
FIRST SEMESTER – APRIL 2011
CH 1503/CH 1500 – CONCEPTS IN INORGANIC CHEMISTRY
Date : 06-04-2011 Dept. No. Max. : 100 Marks
Time : 1:00 – 4:00
PART – A
Answer ALL questions. (10 x 2 = 20marks)
- What are the possible values of quantum numbers n, l ,m and s for an electron in 3d orbital?
- The metallic character increases in the order As< Sb <Bi. Substantiate.
- What would be the effect on lattice energy of increasing the charge on M n+?
- What is inert pair effect?
- Explain the shape of beryllium chloride, using the concept of hybridization,
- He2 + exists while He2 does not. Why?
- What are London forces?
- Why is sodium in liquor ammonia blue?.
- HgO is soluble in HCl but HgS is not. Reason out using HSAB principle.
- What are aprotic solvents? Give one example.
PART – B
Answer any EIGHT questions. (8 x 5 = 40 marks)
- Describe the method of froth floatation.
- How is electronegativity expressed using Mulliken-Jaffé and Allred -Rochow scales? Explain.
- What is electrochemical series? Give one application of this series.
- State and explain Fajan’s rules.
- Using VSEPR theory arrive at the structures of XeF4 and XeF6 .
- Explain the factors that affect lattice energy.
- State and explain isoelectronic principle.
- Construct the qualitative MO energy level diagram of oxygen and account for its paramagnetism.
- State and explain Hume – Rothery rules.
- What are interstitial solid solutions? Explain.
- What are the characteristics of hard and soft acids and bases?
- What are leveling and differentiating solvents? Explain with an example for each.
PART – C
Answer any FOUR questions (4 x 10 = 40 marks)
23.What is an Ellingham diagram? With the help of this diagram, fix the criterion for
- Reduction of metal oxide by carbon at a given temperature
- Reduction of oxide X2O3 by a metal Y and
iii. Reduction of metal oxide by hydrogen.
- a) Construct and explain, Born-Haber cycle for determination of lattice energy of sodium chloride. (6)
- b) What is Born – Lande equation. (4)
- Using the molecular orbital diagram, explain the magnetic properties and stabilities of CO and N2.
- Write a comparative account of the VB and MO theories of bonding.
- Distinguish between conductors, semiconductors and insulators on the
basis of band theory.
- Describe the following reactions in liquid ammonia giving an example for each:
- Acid-base reactions ii. Precipitation reactions iii. Complex formation reactions and
- Ammonolysis. (10)
Latest Govt Job & Exam Updates: