Chemical Bonding And Molecular Structure Worksheet With Answer Key Page 4
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6Chemical Bonding and molecular structure
μ
×
observed
100
μ
Sol. % of ionic character =
theoritical
μ
=
1D
obs
−
−
×
×
×
10
8
= e × d =
4.8 10
esu 1.25 10 cm
μ
theoritial
−
=
×
×
18
4.8 1.25 10 esu.cm
=
×
4.8 1.25 D
1
=
×
=
100 16.66
×
4.8 1.25 D
% of ionic character =
17.
Which one of the following is a planar molecule?
(2003-M)
+
NH
H O
BCl
PCl
1.
2.
3.
4.
3
3
3
3
Ans: 3
Cl
Sol.
B
2
→ sp
and trigonal planar molecule
Cl
Cl
18.
Which one of the following is the correct set with respect to molecule, hybridization and shape?
(2003-M)
2
2
,
,
BeCl sp , linear
BeCl sp , triangular planar
1.
2.
2
2
2
3
,
,
BCl sp , triangular planar
BCl sp , tetrahedral
3.
4.
3
3
Ans: 3
BCl . ‘B’ atoms undergoes sp
2
Sol. In
hybridisation and shape of the molecule is trigonal planar
3
hence (3) is the correct choice.
19.
Which one of the following is the correct set with reference to molecular formula, hybridisation
of central atom and shape of the molecule?
(2002-M)
2
2
3
,
,
,
,
CO sp , bent
H O sp , bent
BeCl sp , linear
H O sp , linear
1.
2.
3.
4.
2
2
2
2
Ans: 3
BeCl . Be atom undergoes sp hybridization and shape of the molecule is linear hence (3) in
Sol. In
2
the correct choice.
0
120 . What
20.
An element M reacts with chlorine to from a compound X. The bond angle in X is
is M?
(2002-M)
1. Be
2. B
3. Mg
4. N
Ans: 2
+
⎯⎯ →
2B 3Cl
2BCl
Sol.
2
3
⎯⎯ →
2
BCl
sp
hybridization
3
And shape of molecule trigonal planar bond angle is 120°.
−
1
K J mol
21.
The bond energies (in
) of P-H, As-H and N-H respectively are
(2002-E)
1. 247, 318 and 389 2. 247, 389 and 318
3. 318, 389 and 247
4. 318, 247 and 389
Ans: 4
Sol. Decreasing order of stability NH
> PH
> AsH
3
3
3
Decreasing order of bond energy N – H > P – H > As – H
4
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