Question 1

Draw the Lewis structure of the cyanamide ion,NCNH-,and give the number of lone pairs of electrons and the number of $ \sigma $- and $\pi $-bonds.

Accepted Answer

3 lone pai

Question 2

Which of the following metal ions has the ground-state electron configuration [Ar]3d6?

Accepted Answer

A)  Ni3+  
B)  Fe2+  
C)  Mn2+  
D)  Cu+  
E)  Ca2+  
A)  Ni3+  
B)  Fe2+  
C)  Mn2+  
D)  Cu+  
E)  Ca2+

Question 3

Two Lewis structures can be written for diazomethane, where the arrangement of atoms is H2C-N-N.The hybrid orbitals used by the bold atoms in these Lewis structures are

Accepted Answer

A)  sp3 or sp2, and sp. 
B)  sp2 and sp. 
C)  sp3 and sp. 
D)  sp3 or sp2, and sp2. 
A)  sp3 or sp2, and sp. 
B)  sp2 and sp. 
C)  sp3 and sp. 
D)  sp3 or sp2, and sp2.

Question 4

Which of the following species has the shortest bond length?

Accepted Answer

A)  NO2- 
B)  NO2+  
C)  NO- 
D)  NO 
E)  NO+  
A)  NO2- 
B)  NO2+  
C)  NO- 
D)  NO 
E)  NO+

Question 5

How many resonance structures can be drawn for N2O?

Accepted Answer

A)  0 
B)  3 
C)  2 
D)  1 
A)  0 
B)  3 
C)  2 
D)  1

Question 6

An element E has the electronic configuration 1s22s22p4 .What is the formula of its compound with lithium?

Accepted Answer

A)  LiE2 
B)  LiE 
C)  Li2E 
D)  Li4E 
A)  LiE2 
B)  LiE 
C)  Li2E 
D)  Li4E

Question 7

What is the formal charge on the Xe atom in XeF4?

Accepted Answer

A)  0 
B)  -4 
C)  +2 
D)  +4 
A)  0 
B)  -4 
C)  +2 
D)  +4

Question 8

Sulfur is more electronegative than oxygen.

Accepted Answer

A) True 
 B)False

Question 9

The molecules OF2 and O3 both have bent shapes .What is the hybridization of the central atom in OF2 and O3,
Respectively?

Accepted Answer

A)  sp3 and sp2 
B)  both sp3 
C)  both sp2 
D)  sp3 and sp 
E)  both sp 
A)  sp3 and sp2 
B)  both sp3 
C)  both sp2 
D)  sp3 and sp 
E)  both sp

Question 10

How many valence electrons are present in W4+?

Accepted Answer

Question 11

Which of the following statements is true?

Accepted Answer

A)  The electronegativity of an atom is defined as electron affinity of the atom. 
B)  The electronegativity of an atom depends only on the value of the ionization energy of the atom. 
C)  Atoms with high ionization energies and high electron affinities have low electronegativities. 
D)  Atoms with low ionization energies and low electron affinities have low electronegativities. 
E)  Atoms with low ionization energies and low electron affinities have high electronegativities. 
A)  The electronegativity of an atom is defined as electron affinity of the atom. 
B)  The electronegativity of an atom depends only on the value of the ionization energy of the atom. 
C)  Atoms with high ionization energies and high electron affinities have low electronegativities. 
D)  Atoms with low ionization energies and low electron affinities have low electronegativities. 
E)  Atoms with low ionization energies and low electron affinities have high electronegativities.

Question 12

What is the shape of XeF4?

Accepted Answer

A)  Square planar 
B)  Tetrahedral 
C)  Trigonal bipyramidal 
D)  Seesaw 
E)  T-shaped 
A)  Square planar 
B)  Tetrahedral 
C)  Trigonal bipyramidal 
D)  Seesaw 
E)  T-shaped

Question 13

Which of the following would have the longest bond?
A) B2 
B) C2 
C) N2 
D) C22-
E) N22-

Accepted Answer

Question 14

All the following are polar except

Accepted Answer

A)  ClF3.  
B)  COCl2.  
C)  BO33- 
D)  BrO3- 
E)  O3.  
A)  ClF3.  
B)  COCl2.  
C)  BO33- 
D)  BrO3- 
E)  O3.

Question 15

Which of the following is an n-type semiconductor?

Accepted Answer

A)  Silicon doped with phosphorus 
B)  Silicon doped with boron 
C)  GaAs with gallium in excess of arsenic 
D)  Selenium doped with indium 
E)  Germanium doped with indium 
A)  Silicon doped with phosphorus 
B)  Silicon doped with boron 
C)  GaAs with gallium in excess of arsenic 
D)  Selenium doped with indium 
E)  Germanium doped with indium

Question 16

Which of the following do not have resonance structures?

Accepted Answer

A)  CH3CONH- 
B)  CH2COCH3- 
C)  H2CO 
D)  All have resonance structures. 
A)  CH3CONH- 
B)  CH2COCH3- 
C)  H2CO 
D)  All have resonance structures.

Question 17

Predict the N-O bond lengths in NO2- given the N-O and N=O bond lengths of 140 and 120 pm,respectively.

Accepted Answer

Question 18

Which of the following only has bond angles of 90$\circ$?

Accepted Answer

A)  IF5  
B)  IF4+ 
C)  XeF2  
D)  SF4  
E)  IO2F3  
A)  IF5  
B)  IF4+ 
C)  XeF2  
D)  SF4  
E)  IO2F3

Question 19

There are three resonance structures of the sulfate ion.A resonance structure can be written where the formal charge on sulfur is 0.

Accepted Answer

A) True 
 B)False

Question 20

How many lone pairs of electrons are found in the Lewis structure of the interhalogen compound ICl3?

Accepted Answer

A)  10 
B)  4 
C)  8 
D)  6 
E)  7 
A)  10 
B)  4 
C)  8 
D)  6 
E)  7

Draw the Lewis structure of the cyanamide ion,NCNH^-,and give the number of lone pairs of electrons and the number of $\sigma$ - and $\pi$ -bonds.

Which of the following metal ions has the ground-state electron configuration [Ar]3d⁶?

Two Lewis structures can be written for diazomethane, where the arrangement of atoms is H₂C-N-N.The hybrid orbitals used by the bold atoms in these Lewis structures are

Which of the following species has the shortest bond length?

How many resonance structures can be drawn for N₂O?

An element E has the electronic configuration 1s²2s²2p⁴ .What is the formula of its compound with lithium?

What is the formal charge on the Xe atom in XeF₄?

Sulfur is more electronegative than oxygen.

The molecules OF₂ and O₃ both have bent shapes .What is the hybridization of the central atom in OF₂ and O₃, Respectively?

How many valence electrons are present in W⁴⁺?

Which of the following statements is true?

What is the shape of XeF₄?

Which of the following would have the longest bond? A) B₂ B) C₂ C) N₂ D) C₂²^- E) N₂²^-

All the following are polar except

Which of the following is an n-type semiconductor?

Which of the following do not have resonance structures?

Predict the N-O bond lengths in NO₂^- given the N-O and N=O bond lengths of 140 and 120 pm,respectively.

Which of the following only has bond angles of 90^$\circ$?

There are three resonance structures of the sulfate ion.A resonance structure can be written where the formal charge on sulfur is 0.

How many lone pairs of electrons are found in the Lewis structure of the interhalogen compound ICl₃?

Atoms

States of Matter

Thermodynamics

Equilibrium

Reactions

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

Exam 2: Molecules

Draw the Lewis structure of the cyanamide ion,NCNH-,and give the number of lone pairs of electrons and the number of σ \sigma σ - and π\pi π -bonds.

Which of the following metal ions has the ground-state electron configuration [Ar]3d6?

Two Lewis structures can be written for diazomethane, where the arrangement of atoms is H2C-N-N.The hybrid orbitals used by the bold atoms in these Lewis structures are

Which of the following species has the shortest bond length?

How many resonance structures can be drawn for N2O?

An element E has the electronic configuration 1s22s22p4 .What is the formula of its compound with lithium?

What is the formal charge on the Xe atom in XeF4?

Sulfur is more electronegative than oxygen.

The molecules OF2 and O3 both have bent shapes .What is the hybridization of the central atom in OF2 and O3, Respectively?

How many valence electrons are present in W4+?

Which of the following statements is true?

What is the shape of XeF4?

Which of the following would have the longest bond? A) B2 B) C2 C) N2 D) C22- E) N22-

All the following are polar except

Which of the following is an n-type semiconductor?

Which of the following do not have resonance structures?

Predict the N-O bond lengths in NO2- given the N-O and N=O bond lengths of 140 and 120 pm,respectively.

Which of the following only has bond angles of 90 ∘\circ∘ ?

There are three resonance structures of the sulfate ion.A resonance structure can be written where the formal charge on sulfur is 0.

How many lone pairs of electrons are found in the Lewis structure of the interhalogen compound ICl3?

Atoms

States of Matter

Thermodynamics

Equilibrium

Reactions

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

Draw the Lewis structure of the cyanamide ion,NCNH^-,and give the number of lone pairs of electrons and the number of $\sigma$ - and $\pi$ -bonds.

Which of the following metal ions has the ground-state electron configuration [Ar]3d⁶?

Two Lewis structures can be written for diazomethane, where the arrangement of atoms is H₂C-N-N.The hybrid orbitals used by the bold atoms in these Lewis structures are

How many resonance structures can be drawn for N₂O?

An element E has the electronic configuration 1s²2s²2p⁴ .What is the formula of its compound with lithium?

What is the formal charge on the Xe atom in XeF₄?

The molecules OF₂ and O₃ both have bent shapes .What is the hybridization of the central atom in OF₂ and O₃, Respectively?

How many valence electrons are present in W⁴⁺?

What is the shape of XeF₄?

Which of the following would have the longest bond? A) B₂ B) C₂ C) N₂ D) C₂²^- E) N₂²^-

Predict the N-O bond lengths in NO₂^- given the N-O and N=O bond lengths of 140 and 120 pm,respectively.

Which of the following only has bond angles of 90^$\circ$?

How many lone pairs of electrons are found in the Lewis structure of the interhalogen compound ICl₃?