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Photonics electronic spectra of molecules

Total questions: 16

Worksheet time: 16mins

Name
Class
Date
1.

The molecular orbital can be represented as ...

a)

sum of atomic orbitals

b)

product of atomic orbitals

c)

linear combination of atomic orbitals

2.

Name the orbital being formed

a)

Bonding

b)

Antibonding

c)

Nonbonding

3.

Name the orbital being formed

a)

Bonding

b)

Antibonding

c)

Nonbonding

4.

The greatest energy is characteristic of ...

a)

antibonding π* orbital

b)

bonding σ orbital

c)

non-bonding n orbital

d)

antibonding σ* orbital

5.

Bonding molecular orbitals are also called ...

a)

occupied

b)

vacant

c)

free

6.

Antibonding molecular orbitals are also called ...

a)

occupied

b)

vacant

c)

free

7.

Which molecular orbitals are antisymmetric with respect to the plane passing through the atomic nuclei and have one nodal surface (антисимметричны относительно проходящей через ядра атомов плоскости и имеют одну узловую поверхность)?

a)

σ-orbitals

b)

π-orbitals

c)

s-orbitals

d)

p-orbitals

8.

What transitions are allowed?

a)

π → σ*

b)

π → π*

c)

n → σ*

d)

n → π*

9.

In the longest wavelength region, there are ... transitions.

a)

σ → σ*

b)

π → π*

c)

n → σ*

d)

n → π*

10.

With an increase in the polarity of the solvent, ... of π → π* band occurs.

a)

hypsochromic shift

b)

bathochromic shift

c)

Stokes shift

11.

With an increase in the polarity of the solvent, ... of n → π* band occurs.

a)

hypsochromic shift

b)

bathochromic shift

c)

Stokes shift

12.

The lifetime of an excited state is ... to the total probability of spontaneous transitions from this state.

a)

proportional

b)

equal

c)

inversely proportional

13.

The absorption of electromagnetic radiation by a substance is described by the law of ...

a)

Franck-Condon

b)

Bouguer- Lambert- Beer

c)

Kirchhoff

d)

Snell

14.

For which objects does the Bouguer- Lambert- Beer law fail?

a)

Scattering media

b)

Weakly luminescent media

c)

Additive mixtures

15.

The most probable transition is such that neither the position of the nuclei nor the momentum changes (не изменяются ни положение ядер, ни импульс).

a)

Franck-Condon principle

b)

Bouguer- Lambert- Beer law

c)

Kirchhoff's law

d)

Snell's Law

16.

An integrating sphere is intended for measuring the absorption spectra of ...

a)

luminescent media

b)

non-additive mixtures

c)

light-scattering media