Paper: CSIR-NET June 2012 · Subject: Physical Chemistry · Chapter: Group Theory · Topic: Symmetry Elements Point Groups · Marks: 2 · Difficulty: Easy
Among the following, the CORRECT statement is:
(a)The number of irreducible representations is equal to classes of symmetry operations.
(b)The number of irreducible representations is equal to the order of the symmetry point group.
(c)The irreducible representations contained in any point group are always of one dimension.
(d)A symmetry point group may not contain a totally symmetric irreducible representation.
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
A basic theorem: the number of irreducible representations equals the number of classes; every group has a totally symmetric representation, and dimensions can exceed one.