2. The electron dot structure for AsCl 3 molecule shows A) a total of 84 electro
ID: 928915 • Letter: 2
Question
2.
The electron dot structure for AsCl3molecule shows
A)
a total of 84 electron dots
B)
three single bonds and 10 lone pairs
C)
two single bonds, one double bond, and 9 lone pairs
D)
one single bond, two double bonds, and 8 lone pairs
E)
three single bonds and one lone pair
5.
How many covalent bonds will be formed by bromine in BrO3– for the dot structure that expands the octet to minimize formal charge and places negative formal charges on only the most electronegative atom(s). The Pauling electronegativity values are:
Br = 2.8; O = 3.5
A)
3
B)
4
C)
5
D)
6
E)
7
6.
Estimate the enthalpy change for the reaction 2CO + O2 ® 2CO2 given the following bond energies.
BE(CºO) = 1074 kJ/mol
BE(O=O) = 499 kJ/mol
BE(C=O) = 802 kJ/mol
A)
+2380 kJ/mol
B)
+744 kJ/mol
C)
+1949 kJ/mol
D)
–561 kJ/mol
E)
–744 kJ/mol
7.
Give the number of lone pairs around the central atom and the molecular shape of the ion ClO3–.
A)
0 lone pairs, trigonal
B)
1 lone pair, bent
C)
1 lone pair, trigonal pyramidal
D)
2 lone pairs, T-shaped
E)
2 lone pairs, trigonal
8.
Which of the following substances is/are bent?
(i) H2S (ii). CO2 (iii) ClNO (iv) NH2– (v) O3
A)
only (iii)
B)
only (i) and (v)
C)
only (i), (iii), and (v)
D)
all are bent except for (iv)
E)
all are bent except for (ii)
9.
Which of the following molecules is polar?
A)
CH4
B)
SF6
C)
F2
D)
CH3F
E)
CO2
10.
Indicate the type of hybrid orbitals used by the central atom in TeF4.
A)
Sp
B)
sp2
C)
sp3
D)
sp3d
E)
sp3d2
11.
The hybridization of the O atom in CO2 will be
A)
S
B)
Sp
C)
sp2
D)
sp3
E)
sp3d
2.
The electron dot structure for AsCl3molecule shows
A)
a total of 84 electron dots
B)
three single bonds and 10 lone pairs
C)
two single bonds, one double bond, and 9 lone pairs
D)
one single bond, two double bonds, and 8 lone pairs
E)
three single bonds and one lone pair
Explanation / Answer
2)
three single bonds and 10 lone pairs
Since As will bond with 1 Cl in a single bond. The lone pair of As + 3*3 lone pair of Cl = 1+9 = 10
NOTE: consider posting all other questions in another set of Q&A. We are not allowed to answer to multiple questions in a single set of Q&A
three single bonds and 10 lone pairs
Since As will bond with 1 Cl in a single bond. The lone pair of As + 3*3 lone pair of Cl = 1+9 = 10
NOTE: consider posting all other questions in another set of Q&A. We are not allowed to answer to multiple questions in a single set of Q&A
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