Question 1

Which of the following transitions in a hydrogen atom corresponds to the emission of the highest frequency photon?

Accepted Answer

$$n = 2 \rightarrow n = 1$$

Question 2

Which set of quantum numbers represents an electron in a 5d orbital?

Accepted Answer

$$n = 5,\ l = 2,\ m_l = 2,\ m_s = -\frac{1}{2}$$

Question 3

Which of the following molecules would heat up in a microwave oven?

Accepted Answer

H$$_2S$$

Question 4

Which of the following species is diamagnetic?

Accepted Answer

Zn$$^{2+}$$

Question 5

Arrange the following elements in order of increasing magnitude of electron affinity: B, F, O, N, C.

Accepted Answer

N \u003c B \u003c C \u003c O \u003c F

Question 6

Which of the following bonds is most polar? Draw bond dipoles for each bond.

Accepted Answer

CO

Question 7

Which molecule contains the longest bond?

Accepted Answer

CH$$_4$$

Question 8

Which of the following isoelectronic ions has the largest radius?

Accepted Answer

O$$^{2-}$$

Question 9

Which of the following molecules has an expanded octet?

Accepted Answer

SF$$_4$$

Question 10

Which of the following is the best Lewis structure contributor for N$$_2O$$?

Accepted Answer

$$N-N\equiv O$$

Question 11

Estimate the molar heat of combustion of ethene (C$$_2H$_4) $$using average bond enthalpies. Which of the following is closest to the correct value?

Accepted Answer

$$-1320\ \mathrm{kJ/mol}$$

Question 12

Which of the following molecules has a square planar geometry?

Accepted Answer

XeF$$_4$$

Question 13

What is the electron geometry, molecular geometry, and molecular polarity of XeOF$$_4$$?

Accepted Answer

octahedral, square pyramidal, polar

Question 14

Which of the following transitions in a hydrogen atom requires absorption of a photon with the lowest energy?

Accepted Answer

$$n = 2 \rightarrow n = 3$$

Question 15

Which of the following does NOT affect absorbance in a spectrophotometry experiment?

Accepted Answer

cell path length

Question 16

Which of the following molecules is isoelectronic with Ne?

Accepted Answer

Mg$$^{2+}$$

Question 17

Which of the following species is most exothermic?

Accepted Answer

Cl$$^{-}$$

Question 18

Which of the following molecules has the greatest N-O bond strength?

Accepted Answer

NO$$^{+}$$

Question 19

Which of the following elements has the highest first ionization energy?

Accepted Answer

Zn

Question 20

Which of the following best describes the bond order in O$$_2$$ according to molecular orbital theory?

Accepted Answer

$$2$$

General Chemistry: Quantum Mechanics, Bonding, and Molecular Geometry Study Guide

Study Guide - Practice Questions