spectroscopy quiz

1. The vibrational frequency of a molecule is proportional to:

• E) wavelength of light
• F) mass of proton
• A) reduced mass

• G) temperature of the system

The selection rules for Rayleigh lines, Stokes lines and anti-Stokes lines, respectively are :

• (C) 0, +2,-2

• (D) 0,-2,+2

• (B) ±2,0,2

• (A) 0,±2,2

VPOROSSEN

62. One of the commonest Schrodinger wave equation is form of

(A) ²+8m² (E-V) = 0

4π²m (B)² + 4 (E-V) ψ = 0 h²

(C) ² + 8π²m h (Ε - V) ψ = 0

(D) ∇² + 8h2m π² (Ε - V) ψ = 0

• B. 4π²m (B)² + 4 (E-V) ψ = 0 h²
• A. ∇² + 8m² (E-V) = 0
• D. ∇² + 8h2m π² (Ε - V) ψ = 0
• C

63. Which of the following statements is true regarding hybrid orbitals?

• D) Hybrid orbitals are always linear in geometry
• B) Hybridization results in the formation of fewer orbitals than before
• A) Hybrid orbitals have higher energy than pure orbitals
• (C) They can form more stable bonds than the pure orbitals

53. Expression for energy for a particle in one dimensional box is

• E = n²h² / 8ma²
• E = n²h² / 4ma²

• E = nh² / 8ma²
• E = nh² / 8ma²

Valence bond theory of chemical bonding was put forward initially

• A. Bohr
• (C) Heitler and London

• (D) de-Broglie

• D. Pauli

The number of orbitals in n = 4 is:

• 12
• 24
• 4
• 32

Chemical shifts (6) are typically reported in units of:

• F) Newton per coulomb (N/C)
• E) Tesla (T)
• (A) Gauss (G)

• (C) Parts per million (ppm)

Number of molecular arbitals formed by the linear combination of two atomic orbitals is:

(A) 0

(B) 1

(D) 4

• (B) 1

• (C) 2

• (D) 6
• (A) 4

Which of the following solvent is not used in NMR ?

• D₂O
• CCl4

• CH3OH
• CDCl3