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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
B.Sc.DEGREE EXAMINATION -CHEMISTRY
FIRST SEMESTER APRIL 2018
17/6UCH1MC01- BASIC CONCEPTS IN INORGANIC CHEMISTRY
Date: 25-04-2018 Dept. No. Max. 100 Marks
Time: 01:00-04:00
PART A
ANSWER ALL QUESTIONS 10x 2 20 Marks
1. Arrange the following orbitals in the increasing order of energy based on Aufbau principle. 4s, 5d, 6s and 4f.
2. Classify the elements as metals/non metals /metalloids. phosphorus ii) germanium
iii) iodine iv) lead
3. Why is the second ionization energy of sodium greater than that of magnesium.
4. Mention the oxidation number of chromium in potassium chromate and potassium dichromate.
5. Draw the electron dot formula for CO2 and HCN.
6. Draw the structure of ammonia and mention its hybridisation.
7. Calculate the bond order of O2-and predict the magnetic nature.
8. How do you classify solids based on their electrical conductivity?
9. What is bleaching powder? Mention its importance.
10. Distinguish iodometry from iodimetry.
PART B
ANSWER ANY EIGHT QUESTIONS 8 x 5 40 Marks
11. State Heisenberg theory of uncertainty principle. Pauli's exclusion principle.
12. Discuss the factors affecting electron affinity.
13. Classify the following as Bronsted Acid or Bases. HCl ii) NH3 iii) NH4+ iv)Cl- KOH
14. Explain the concept of Arrhenius acids and bases. Mention any two strong bases along with their chemical formula.
15. Calculate the oxidation number of oxygen in MgO, OF2, O2F2, Cl2O7, KO2 and Na2O2.
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Which among the following are oxidising/reducing agents KMnO4 ii) LiAlH4 iii) K2Cr2O7iv)
NaBH4
16. Explain how the molecular shapes are predicted using Sidgwick-Powel theory.
17. Mention the shape, bond angle, number of bond pairs and lone pairs in PCl5 and CH4
18. Draw the electron dot formula of ammonia and carbon tetrachloride. What are the limitations of octet rule?
19. What is bond order? Calculate the bond order for F2 and N2.
20. Distinguish n-type from p-type semi conductor with suitable examples.
21. Write a note on the variation in the ionization energy, electron affinity and atomic radii along the period and down a group.
22. Draw the structures of ClF3, BrF5, IF7 ICl4-.
PART C
ANSWER ANY FOUR QUESTIONS 4 x 10 40 Marks
23. Mention the salient features of modern periodic table over Mendeleev periodic table and also mention the drawbacks of the modern periodic table .
24.a) What are the criteria employed for the calculation of oxidation number of elements.
Mention the postulates of VBT and predict the shape of [PdCl4]2-
25. Explain the hybridisation and geometry in ammonia and BeCl2
What are the rules for Linear Combination of Atomic Orbitals?
26. Sketch the molecular orbital diagram of oxygen molecule and calculate the bond order.Arrange
the following in the increasing bond order O2- and O22+
27. Mention any four pseudohalogens and explain the properties of CN-.
Write a note on the oxidation states of various hypohalous acids
28. Balance the following equation by oxidation number method
K2Cr2O7 Na2SO3 giving Cr(III) and SO42- in acidic medium.
Explain the role of liquid ammonia as a solvent.