ch 08 09 prac test - ibiokaare.com · 25) According to VSEPR theory, if there are five electron domains in the valence shell of an atom, they will be arranged in a(n) _____ geometry

- B) Mg6+ C) Mg2+ D) Mg6- E) Mg2-

2) Based on the octet rule, phosphorus most likely forms a __________ ion.

A) P5- B) P5+ C) P+ D) P3- E) P3+

3) Which ion below has a noble gas electron configuration?

A) B2+ B) Be2+ C) C2+ D) N2- E) Li2+

4) The electron configuration of the phosphide ion (P3-) is __________.

A) [Ne]3s23p3 B) [Ne]3s23p1 C) [Ne]3s2 D) [Ne]3p2 E) [Ne]3s23p6

5) The halogens, alkali metals, and alkaline earth metals have __________ valence electrons, respectively.

A) 8, 2, and 3 B) 7, 1, and 2 C) 2, 7, and 4 D) 2, 4, and 6 E) 1, 5, and 7

6) Lattice energy is __________.

A) the sum of electron affinities of the components in an ionic solid

B) the energy required to convert a mole of ionic solid into its constituent ions in the gas phase

C) the sum of ionization energies of the components in an ionic solid

D) the energy given off when gaseous ions combine to form one mole of an ionic solid

E) the energy required to produce one mole of an ionic compound from its constituent elements in theirstandard states

7) In which of the molecules below is the carbon-carbon distance the shortest?

A) H3C-CH3

B) H-C”C-H

C) H2ChChCH2

D) H3C-CH2-CH3

E) H2ChCH2

8) Of the atoms below, __________ is the most electronegative.

A) Ca B) Rb C) S D) Cl E) Si

1) Based on the octet rule, magnesium most likely forms a __________ ion.

A) Mg

AIIMS,CBSE,AIPMT, AFMC,Bio.Tech & PMT, Contact :- 9438559863, Mail at :- [email protected],www.ibiokaare.com,compiled by AKB

9) Electronegativity __________ from left to right within a period and __________ from top to bottom within agroup.

A) increases, increases

B) increases, decreases

C) decreases, increases

D) stays the same, increases

E) increases, stays the same

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

10) The Lewis structure of AsH3 shows __________ nonbonding electron pair(s) on As.

A) 0

B) 1

C) 2

D) 3

E) This cannot be determined from the data given.11) The Lewis structure of HCN (H bonded to C) shows that __________ has __________ nonbonding electron

pairs.

A) C, 1 B) N, 2 C) C, 2 D) N, 1 E) H, 1

12) The Lewis structure of N2H2 shows __________.

A) each nitrogen has one nonbinding electron pair

B) each hydrogen has one nonbonding electron pair

C) each nitrogen has two nonbinding electron pairs

D) a nitrogen-nitrogen single bond

E) a nitrogen-nitrogen triple bond

(i) PCl3

(ii) CH2 2

(iii) HCN (iv) C2H4 3

13) In which Lewis structure does the central atom have a non-zero formal charge?

A) (i) B) (ii) C) (iii) D) (v) E) none

14) The formal charge on carbon in the molecule below is __________.

A) 0 B) +1 C) -1 D) +3 E) +2

without expanding octet on the sulfur atom(sulfur is the central atom)?

A) 3 B) 0 C) 4 D) 2 E) 1

15) How many equivalent resonance forms can be drawn for SO2

(v) NH

Consider the following species when answering the questions that follow:

Cl


16) The central atoms in __________ cannot expand octet.

A) (i) only B) (ii) only C) (i) and (ii) D) (ii) and (iii) E) (iii) and (iv)

2

For the questions that follow, consider the BEST Lewis structures of the following oxyions:

17) The Lewis structure of __________ cannot be drawn without a non-zero formal charge on the central atom.

A) (i) B) (ii) C) (iii) D) (iv) E) (v)

-32-(v) BrO(iv) SO

432-

(iii) SO-(ii) NO

3-(i) NO

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

18) Lewis structures of which ions can be drawn with and without expanding the octet on the central atom?

A) (i) and (ii)

B) (iii) only

C) (iv) only

D) (iii) and (iv)

E) (iii), (iv), and (v)

20) The central atom in __________ does not violate the octet rule.

A) KrF2 B) XeF4 C) CF4

D) ICl4- E) SF

4

19) Lewis structures of which ions can be drawn with all formal charges being zero?

A) all

B) (i) and (ii)

C) (ii) only

D) (iii), (iv), and (v)

E) none

21). Refer to Molecular Orbital Theory. What is the molecular orbital configuration of N2? a. [core electrons] (σ2s)2 (σ*2s)2 (π2p)2 (σ2p)2 (σ*2p)2 b. [core electrons] (σ2s)2 (σ*2s)2 (π2p)2 (σ2p)2 (π*2p)2 c. [core electrons] (σ2s)2 (σ*2s)2 (π2p)4 (σ2p)2 d. [core electrons] (σ2s)2 (σ*2s)2 (π2p)4 (σ2p)2 (π*2p)4 e. [core electrons] (σ2s)2 (σ*2s)2 (π2p)4 (π*2p)2


22) Using the table of average bond energies below, the DH for the reaction is __________ kJ.

A) increases, increases

B) decreases, decreases

C) increases, decreases

D) decreases, increases

E) is unpredictable

23) As the number of covalent bonds between two atoms increases, the distance between the atoms __________ andthe strength of the bond between them __________.

A) +506 B) -506 C) -129 D) +129 E) -931

Bond: C”C C=C H-I C-I C-HD (kJ/mol): 839 614 299 240 413

ChCHI (g)2H-C”C-H (g) + H-I (g) ¬ H

A) trigonal bipyramidal

B) tetrahedral

C) linear

D) octahedral

E) trigonal planar

24) According to VSEPR theory, if there are three electron domains in the valence shell of an atom, they will bearranged in a(n) __________ geometry.

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

25) According to VSEPR theory, if there are five electron domains in the valence shell of an atom, they will bearranged in a(n) __________ geometry.

A) tetrahedral

B) linear

C) octahedral

D) trigonal planar

E) trigonal bipyramidal

26) The electron-domain geometry and molecular geometry of iodine trichloride are __________ and __________,respectively.

A) T-shaped, trigonal planar

B) trigonal planar, trigonal planar

C) trigonal bipyramidal, T-shaped

D) tetrahedral, trigonal pyramidal

E) octahedral, trigonal planar

27) The molecular geometry of __________ is square planar.

A) CCl4 B) XeF4 C) ICl3 D) XeF2 E) PH3


28) The molecular geometry of the H

A) trigonal pyramidal B) octahedral

C) bent D) tetrahedral

E) linear

A) T-shaped

B) trigonal pyramidal

C) tetrahedral

D) bent

E) trigonal planar ion is __________.-3

32) The molecular geometry of the BrO

3

E) All of these will have bond angles of 120e.

3

D) ClF

3

C) PH

3

B) BCl

31) Of the following species, __________ will have bond angles of 120e.

A) NCl

ion is __________.+430) The molecular geometry of the PF

229) The molecular geometry of the CS

ion is __________.O+

3

molecule is __________.

A) tetrahedral B) T-shaped C) bent

D) trigonal planar E) linear

A) trigonal bipyramidal B) tetrahedral

C) trigonal pyramidal D) octahedral

E) trigonal planar

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

33) The molecular geometry of the left-most carbon atom in the molecule below is __________.

A) octahedral

B) tetrahedral

C) trigonal planar

D) T-shaped

E) trigonal bipyramidal

34) The bond angles marked a, b, and c in the molecule below are about __________, __________, and __________,respectively.

A) 120e, 120e, 90eB) 90e, 90e, 90eC) 120e, 120e, 109.5eD) 109.5e, 90e, 120eE) 109.5e, 120e, 109.5e

35) The central iodine atom in IF5 has __________ unbonded electron pairs and __________ bonded electron pairsin its valence shell.

A) 1, 4 B) 4, 1 C) 1, 5 D) 0, 5 E) 5, 1

36) Of the molecules below, only __________ is polar.

A) SbF5 B) I2

C) AsH3 D) SF6 E) CH4

37) Of the molecules below, only __________ is nonpolar.

A) IF3 B) BrCl

3 C) PBr3 D) NF E) BF3

38) The molecular geometry of the CHF3 molecule is __________, and the molecule is __________.

3


A) seesaw, nonpolar B) trigonal pyramidal, polar C) tetrahedral, nonpolar

D) seesaw, polar E) tetrahedral, polar

B) sp C) sp

23dE) sp2 C) sp D) sp3ps)d B3

40) The hybridization of the carbon atom in carbon dioxide is __________.

A) sp

3dE) sp2D) spd

233A) sp

39) The electron-domain geometry of a carbon-centered compound is tetrahedral. The hybridization of the centralcarbon atom is __________.

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

41) The hybridization of the central atom in the XeF4 molecule is __________.

A) sp2 B) sp d2 C) sp D) sp d E) sp3

42) The sp3d2 atomic hybrid orbital set accommodates __________ electron domains.

A) 2 B) 3 C) 4 D) 5 E) 6

3 and IF5

are __________ and __________, respectively.

A) sp3, sp3d B) sp3d, sp3 3d, sp3d2 D) sp

3 , sp3d

2 E) sp3d

2, sp3

d

2 hybrid orbitals

C) two sp hybrid orbitals

D) three sp hybrid orbitals

E) three sp hybrid orbitals45) The angles between sp2 orbitals are __________.

A) 109.5e B) 120e C) 180e D) 45e E) 90e

47) There is/are __________ s bond(s) in the molecule below.A) 1 B) 2C) 12 D) 13

E) 18

44) The blending of one s atomic orbital and two p atomic orbitals produces __________.

A) two sp

32

hybrid orbitals

B) three sp

3

43) The hybridizations of iodine in IF

C) sp d2

3 3


46) A typical triple bond consists of __________.

A) three ionic bonds B) three pi bonds

C) three sigma bonds D) two sigma and one pi bond

E) one sigma and two pi bonds

A) 0 B) 1 C) 2 D) 4 E) 16

48) There is/are __________ p bond(s) in the molecule below.

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

49. Which of the following is a correct Lewis structure for oxygen?

A. B.

C.

D.

E.


50. Which of the following is a correct Lewis structure for C2H6O?

D. Answers a and c are correct. E. Answers a, b, and c are correct.

51. Which Lewis structure is possible for N2O?

C.

E.

D.

B.

A.

C.

B A.

D. N2O E. All of the above are correct structures.

A. NO2 B. NO2

- C. NO

52.. Which of the following is not a correct Lewis structure?

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

53. What is the correct Lewis structure of SF4?

A.

B.

C.

D.

E.


54. Which of the following are correct resonance structures of SO3?

A. (1) and (5) B. (2) and (4) C. (1), (2), and (4) D. (2), (3) and (4) E. (1), (2), (4), and (5)

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

electrons assigned to the atom in a Lewis structure.

b.

c.

d.

e.

55. How many lone pairs of electrons are on the sulfur atom in sulfite ion, SO32-?

A. 0 B. 1 C. 2 D. 3 E. 4

covalent bonds. E. the difference between the number of valence electrons in a free atom and the number of

57. What is the formal charge on each atom in dichloromethane, CH2Cl2?A. C = 0, H = 0, Cl = 0 B. C = 0, H = -1, Cl = +1 C. C = 0, H = +1, Cl = -1 D. C = -2, H = +1, Cl = +1 E. C = +4, H = -1, Cl = -1

on any atom in a Lewis structure. C. the difference between the number of valence electrons and the number of protons in any given atom. D. equal to the number of valence electrons in a free atom minus the number of shared in

58. Using formal charges and the octet rule, determine which Lewis structure of OCN- is most stable. a.


56. Formal charge is A. the absolute value of the charge on a polyatomic anion or cation. B. the difference between the number of lone pairs of electrons and shared pairs of electrons

61. Which of the following species have the same molecular geometry: CO2, H2O, BeCl2, and N2O? A. CO2 and N2O only B. H2O and N2O only C. H2O and BeCl2 only D. CO2 and BeCl2 only E. CO2, BeCl2, and N2O

59. Use VSEPR theory to predict the molecular geometry of BH3. A. triangular planar B. triangular pyramidal C. linear D. tetrahedral E. triangular bipyramidal

60. Use VSEPR theory to predict the molecular geometry of ICl3.A. triangular planar B. triangular pyramidal C. triangular bipyramidal D. t-shaped E. octahedral

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

65. How many sigma and pi bonds are present in the following molecule?

A. sp → sp2

62. What are the bond angles in SF6?A. 90º and 180º B. 109.5º C. 120º D. 90º and 120º E. 180º

63. What is the hybridization of the carbon atoms in benzene, C6H6? A. sp B. sp2 C. sp3 D. sp3d E. sp3d2

64. What hybridization change does the carbon atom undergo in the combustion of methane? CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

B. sp2 → sp3 C. sp3 → sp D. sp2 sp E. none

A. 8 sigma bonds and 1 pi bond B. 8 sigma bonds and 2 pi bonds C. 10 sigma bonds and 2 pi bonds D. 11 sigma bonds and 2 pi bonds E. 11 sigma bonds and 1 pi bond


67. Which of the following compounds is expected to have the strongest ionic bonds? A. RbF B. NaF C. NaI D. CsBr E. CsI

66. Which element is the most electronegative?A. phosphorus B. silicon C. carbon D. nitrogen E. oxygen

68. The central atom in XeF4 is surrounded by A. 3 single bonds, 1 double bond, and no lone pairs of electrons. B. 2 single bonds, 2 double bonds, and no lone pairs of electrons. C. 3 single bonds, 1 double bond, and 1 lone pair of electrons. D. 4 single bonds, no double bonds, and no lone pairs of electrons. E. 4 single bonds, no double bonds, and 2 lone pairs of electrons.

69. Which one of the following molecules has a dipole moment? A. CI4 B. PF5 C. NCl3 D. SO3 E. O2

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

70. Label the hybridization at C#1, C#2, C#3, and C#4 in the molecule. C1 C2 C3 C4 a. sp sp sp3 sp3d b. sp sp sp2 sp3 c. sp sp2 sp2 sp2 d. sp2 sp2 sp3 sp3 e. sp3 sp3 sp3 sp3

71. Which molecule is polar?A. BF3 B. H2Se C. N2 D. GeF4 E. CO2


72. London forces exist A. for all molecules. B. only for molecules with nonpolar bonds. C. only for molecules with polar bonds. D. only for molecules with metallic bonds. E. only for molecules with hydrogen bonding.

73. Which of the following interactions are present between CO2 molecules? I. London forces II. ion-dipole forces III. hydrogen bonding IV. dipole-dipole attractionsA. I only B. II and III C. II only D. III only E. Iand IV

74. How many sigma (σ) bonds and pi (π) bonds are in the following molecule?

A. five σ and two π B. five σ and three π C. five σ and five π D. seven σ and two π E. seven σ and three π

75. Which of the following characteristics apply to PCl3? 1. nonpolar molecule 2. polar bonds 3. trigonal-pyramidal molecular geometry 4. sp2 hybridized A. 1 and 2 B. 2 and 3 C. 3 and 4 D. 1, 2, and 3 E. 1, 2, 3, and 4

A. C1 and C2 B. C1, N, and O C. N and O D. O and C2 E. O only

76. Which of the underlined atoms (C1, C2, N, and O) are sp2 hybridized?

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

2- e. Be2

2- a. H2


79. Use molecular orbital theory to predict which species is paramagnetic.A. N2 B. O2 C. F2 D. Li2 E. H2

78. According to molecular orbital theory, what is the bond order of nitrogen, N2? A. 1 B. 3/2 C. 2 D. 5/2 E. 3

77.According to molecular orbital theory, which of the following species is the most likely to exist?

b. He2 c. Li2 d. Li2

Molecular Orbital Theory The following molecular orbital diagram may be used for the following problems. For oxygen and fluorine, the σ2p orbital should be lower in energy than the π2p. However, the diagram will still yield correct bond order and magnetic behavior for these molecules.

phases (solid, liquid or gas) of a substance

metals D Atoms of a given atomic number that have a specific number of neutrons E The different

B A pair of substances that differ by H+ C Elements that possess properties intermediate between those of metals and non-

A Different structural forms of an element

80. Which one of the following best defines the word “allotropes”?

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com


85. Which one of the following species has the least number of electrons?

17 Cl–

20 Ca2+

E 35

18 Ar

D 40

18 Ar

C 40

A 3517 Cl

B 39

D 214Po

E 212Tl

A 218Bi B 216Bi C 216Pb

84. 222Rn is unstable and decays by losing 6 neutrons and 2 protons. What is the final decay product?

83. Which one of the following statements concerning elements in the Periodic Table is correct?

B Elements of Group 16 occur as cations in ionic compounds.C Oxides of elements in Groups 16 and 17 are basic. D The halogens (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.

A Elements of the same group all have the same number of electrons in the outermost occupied electron shell.

C Mg2O3D MgO2 E Mg2O

A MgOB Mg2O2

82. What is the formula of the compound formed between magnesium and oxygen?

81. How many electrons are there in the valence shell of the O2– ion?

10 D 16 E 18

C B 8

A 2 ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

A O2 and O3

B 3517Cl and 3717Cl

C I2(g) and I2(s)

D Mg2+ and Ne E F+ and F–

80Hg2+?

A 1514Si

B 29

15P

D 29

14Si

E 2915P


86. Which one of the following pairs are isotopes?

87. Which one of the following describes the major intermolecular force in I2(s)?

A covalent bonds B ionic bonds C hydrogen bonds

D dispersion forces E dipole-dipole forces

88. How many protons (p), neutrons (n) and electrons (e) are present in 200

A 200 p 80 n 198 e B 80 p 120 n 78 e C 120 p 80 n 118 e D 80 p 200 n 78 e E 120 p 200 n 118 e

89. Which symbol correctly represents an isotope with 14 protons and 15 neutrons?

14 P

C 30

90. How many bonding and non-bonding electron pairs are found in the BF3 molecule?

A 1 bonding and 3 non-bondingB 2 bonding and 2 non-bonding C 3 bonding and 1 non-bonding

D 3 bonding and 0 non-bonding E 4 bonding and 0 non-bonding

91. Which one of the following pairs of atoms would form a non-polar covalent bond? A C and O B N and O C Cl and Cl D Na and Cl E Ne and Ne

92. Which one of the following species has the same electron configuration as the Al3+ cation?

A F – B Cl– C S2– D O– E Mg+

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

A –VI B –II

C 0 D +V

E +VI

96. What is the oxidation number of phosphorus in KH2PO4?


D. E.

A. B. C.

y y

y y y

z z

z z z

x x

x x x

93. Which one of the following elements has valence electrons in the n = 3 shell?

95. Which one of the following structures represents a 2pz atomic orbital?

A oxygen B carbon dioxideC sodium chloride D magnesium fluorideE helium

94. Which one of the following species contains a polar covalent bond?

A beryllium B oxygenC silicon D neon E hydrogen

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions.

C The direction of a redox reaction can only be determined experimentally.

D Half-cell potentials for half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

99. Which one of the following statements regarding a catalyst is not correct?

100. Which one of the following statements is not correct?


B We have to measure the cell potential to obtain the difference in potential energy because the potential of half-reactions cannot be measured directly.

D Catalysts do not alter the equilibrium constant for a chemical reaction.

C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy.

B An enzyme is a protein that is a highly efficient catalyst for one or more chemical reactions in a living system.

A An enzyme is a catalyst that only binds certain substrates.

A HCOOH B CH3CN

C CCl4 D SiH4

E CH3OCH3

98. Which one of the following substances will form strong hydrogen bonds?

A hydrogen bonding

B dipole-induced dipole C ion-dipole

D dipole-dipole E ionic

97. Which force is most important in allowing ammonia, NH3, to dissolve in water?

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

1) C2) D3) B4) E

5) B

6) B

Answer Key

7) B8) D

9) B

10) B

11) D12) A13) E

14) A

15) D

16) C17) B18) E19) E20) C

41) B42) E

43) C

44) B

45) B

46) E

47) C48) C

21. C

49. A

50. D 51. B

52. C 53. B

54. B 55. B 56. E 57. A

59. A 60. D

58. B

61. E 62. A

63. B 64. C 65. E 66. E

67. B 68. E 69. C

70. B 71. B 72. A 73. A 74. E

81

82

83

84

85

86

87

88

89

A

B

80.A

A

D A

B

D

B

D23) D24) E

22) C

25) E

26) C

27) B

28) A29) E30) B

31) B32) B

33) B34) E35) C36) C37) E38) E39) A40) C

79.B

75. B 76. A 77. C 78. E

90 91 92 93 94 95 96 97 98 99D C A C B B D A A C 100C


ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

ww

w.ibiokaare.com

Documents

ch 08 09 prac test - ibiokaare.com · 25) According to VSEPR theory, if there are five electron domains in the valence shell of an atom, they will be arranged in a(n) _____ geometry