Chemistry-I exam (CHEM 101) from BUTEX affiliated colleges' 2021 Level-1 Term-I finals. Questions address bond order concepts, VBT explanations, ligand definitions, accuracy versus precision, orbital shapes, crystal field splitting, and equilibrium constants.
Level-1 Term-I, Final Exám-2021
Subject: Chemistry-I (Code: CHEM 101)
Time: 3.0 Hrs. Full Marks: 72
(Use separate answer script for Part: A and Part: B)
(All parts of a question must be answered consecutively)
Part: A
(Answer any three questions)
1. (a) What are meant by ‘hybrid-bond’ and ‘bond-order’?
(b) Explain why the formation of -molecule is possible but molecule is impossible by using bond-order.
(c) State the concept of VBT (valence-bond-theory) with example.
(d) What are ‘Ligands’ and ‘Chelate group’?
[4+2+4+2=12]
2. (a) Why is strong acid than ?
(b) Write the modern concepts of acid and base theory.
(c) From the acid-base neutralization theory, prove that (where the symbols follow the conventional rules).
(d) Distinguish between ‘accuracy’ and ‘precision’.