10) Give the number of lone pairs around the central atom and the C) 2 lone pairs, bent D) 3 lone pairs, bent A) 0 lone pairs, linear B) 1 lone pair, bent 11) Indicate the type of hybrid orbitals used by the central atom in OBr6. C) sp A) sp B) sp² D) sp'd E) sp'd
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
please solve only question 11
![1) Which of the following make an isoelectronic pair?
A) Ca and Fe
B) O and F
C) F and CI D) Cl and Ca
2) Arrange the following ions in order of increasing ionic radius: K', P, S, CI. increasing radius →
E) None of the above
A) K'<CT <S² <P³
B) K<P <S² <CT C) P³¹ <S² <CI <K
3) Which of the elements listed below has the highest first ionization energy?
D) CI <S² <p³<K'
A) He
B) Ne
C) Ar
D) Kr
E) Xe
4)
The successive () ionization energies of a certain element are I₁=589.5 kJ/mol, ₂-1145
kJ/mol, I=4900 kJ/mol, 4-6500 kJ/mol, and Is-8100 kJ/mol. This pattern of ionization energies
suggests that the unknown element is
A) K
B) Si
C) As
D) Ca
E) S
5) Which of the following elements has the greatest electron affinity?
A) Mg
B) Al
C) Si
D) P
E) S
6)
Select the series of atoms that are arranged in order of increasing electronegativity.
A) S< K<Fe< Si<0
B) Fe< K<S< Si<0
C) O<S< Si< Fe< K
D) O< Si<S< Fe< K
E) None of the above are in order of increasing electronegativity.
7) The bond in which one of the following pairs of atoms would be the most polar?
A) B-C
B) C-N
C) CO
D) Si-O
8) The Lewis structure for CS, is:
...
" **
**
"
**
A) C=S-S
B) :S-C-S:
C)
S=C=S
..
.. ..
**
..
9) Which choice includes
all the molecules below that do not follow the octet rule?
(1) H₂S
(2) BF,
(3) PH,
(4) SI
D) (3) and (4)
A) (2) and (4)
B) (2) and (3)
C) (1) and (2)
10) Give the number of lone pairs around the central atom and the geometry of the ion (FS₂)
C) 2 lone pairs, bent D) 3 lone pairs, bent
A) 0 lone pairs, linear B) 1 lone pair, bent
11) Indicate the type of hybrid orbitals used by the central atom in OBr
A) sp
B) sp
C) sp³
D) sp'd
E) sp'd
12) The molecular structure of SeO₂ is:
A) Linear
B) T-shaped
C) Bent
D) Tetrahedron
E) Trigonal Planner
13) The number of pi bonds in the molecule below is
4 Η
ECH
A) 18
B) 16
HOC-
C) 9
E) C-C
**** ..
D) S=C-S:
D) 3
E)
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