Chemical Bonding and Molecular Structure Test 30

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Chemical Bonding and Molecular Structure Test 30

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Weekly Quiz Competition

Question 1
1 / -0

The cation containing maximum number of unpaired electrons is:

A
$$Co^{2+}$$

B
$$Ni`^{2+}$$

C
$$Fe^{3+}$$

D
$$Fe^{2+}$$

Solution
Question 2
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Which of the following is not correct

A
A sigma bond is weaker than $$\pi$$ bond

B
A sigma bond is stronger than $$\pi$$ bond

C
A double bond is stronger than a single bond

D
A double bond is shorter than a single bond

Solution

Option (A), is not correct.
(A): $$\text{A sigma bond is weaker than pi bond.}$$
A sigma bond is the end-to-end overlap of the bonding orbitals.whereas, a pi bond is the side-to-side overlap of (usually) two p-orbitals. This places the electron density above and below the plane of the nuclei with a node in the middle. The nodal region reduces the degree to which the orbitals overlap and therefore a pi bond is less strong than a sigma bond between the same two elements.

(B): A sigma bond is stronger than π bond.

(C): A(=) bond is stronger than a single bond. It is because there are more electrons to be shared by the two atoms, so the nuclei are more attracted. The bonds to be longer because there are more electrons and the electrons would repel each other more.

(D): A double bond is shorter than single bond. Another consequence of the presence of multiple bonds between atoms is the difference in the distance between the nuclei of the bonded atoms. Double bonds have shorter distances than single bonds, and triple bonds are shorter than double bonds.
Question 3
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The enolic form of acetone contains:

A
9 sigma bonds, 1 pi bond and 2 lone pairs

B
8 sigma bonds, 2 pi bond and 2 lone pairs

C
10 sigma bonds, 1 pi bond and 1 lone pair

D
9 sigma bonds, 2 pi bond and 1 lone pair

Solution

$$\quad { C }H_{ 3 }-\overset { \underset { | }{ :\overset { .. }{ O } -H } }{ { C } } =CH_{ 2 }$$

It has $$9 \sigma , 1 \pi $$ and 2 lone pairs.
Question 4
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Which of the following option is correctly matched

A
$$ S_{3}O_{9} $$ : contains no S-S linkage

B
$$ S_{2}O^{2}_{6 } $$ ; contains -O-O-linkage

C
$$ (HPO_{3})_{3} $$; contains P-P linkage

D
$$ S_{2}O^{2-}_{8} $$ ; contains S-S linkage

Solution

$$S_3O_9$$ have contain S-S limkage
Question 5
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In the sigma bond

A
Sidewise as well as end to end overlap of orbitals take place

B
Sidewise overlap of orbitals take place

C
End to end overlap of orbitals takes place

D
None of the above

Solution

Answer is Option C is a correct answer.
$$Sigma$$ $$bond$$:
A covalent bond resulting from the formation of a molecular orbital by the $$\text{end-to-end overlap of atomic orbitals}$$, denoted by the symbol $$σ$$.
Question 6
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In $$N_2$$ molecule, the atoms are bonded by:

A
One $$\sigma$$ and Two $$\pi$$

B
One $$\sigma$$ and one $$\pi$$

C
Two$$\sigma$$ and one$$\pi$$

D
Three $$\sigma$$ bonds.

Solution

$$N_2$$ molecule contains 2 lone pairs and 1s and 2p bonds.
$$:N≡N:$$
A triple bond consist of $$\text{1 sigma and two pi bonds}$$. Lone pair refers to a pair of valence electrons that are not shared with another atom, it is also called non-bonding pair.
Question 7
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The number and type of bonds between two carbon atoms in calcium carbide are:

A
One sigma, one pi

B
One sigma, two pi

C
Two sigma, one pi

D
Two sigma, Two pi

Solution

Option B is correct.
Question 8
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which of the following statements is false

A
$$ H_{2}PO_{2} $$, $$ H_{3}PO_{3} $$,$$ H_{3}PO_{4} $$ all are tribasic and reducing in nature

B
Among anions, $$ NO_{3}^{-} $$, $$ SO^{2-}_{3} $$,$$ SO^{2-}_{4} $$,$$ S_{2}O_{4}^{2-} $$,$$ H_{2}SO_{4} $$ , $$ SO^{2-}_{3} $$ is basic reducing nature

C
Number of anions $$ SO^{2-}_{3} $$,$$ SO^{2-}_{4} $$, $$ SO^{2-}_{4} $$, and $$ H_{2}SO_{4} $$,$$ SO^{2-}_{3} $$

D
Number of lone pair(s) electrons on Xe atoms in $$ XeF_{2} $$,$$ XeF_{4} $$,$$ XeF_{6} $$ are 3,2,and 1 respectively.

Solution

(C) $$ SO^{2-}_{3} $$ contains one lone pair of electrons and sulphur atoms.
Question 9
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The double bond between the two carbon atoms in ethylene consists of

A
Two sigma bonds at right angles to each other

B
One sigma bond and one pi bond

C
Two pi bonds at right angles to each other

D
Two pi bonds at an angle of $$60^{\circ}$$ to each other

Solution

Therefore on seeing the figure we say that:

There is a $$\text{One sigma bond and one pi bond}$$.
Therefore Option B is the correct answer.
Question 10
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An electrically charged atom or a group of atoms is known as:

A
A meson

B
A proton

C
An ion

D
A cyclotron

Solution

Meson is any member of a family of subatomic particles composed of a quark and an antiquark.
proton is a positively charged elementary particle that is a fundamental constituent of all atomic nuclei.
ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
A cyclotron is a class of devices that accelerates charged atomic or subatomic particles in a constant magnetic field.

Hence, option $$C$$ is correct.

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Chemical Bonding and Molecular Structure Test 30

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Question 1

$$Co^{2+}$$

$$Ni`^{2+}$$

$$Fe^{3+}$$

$$Fe^{2+}$$

Solution

Question 2

A sigma bond is weaker than $$\pi$$ bond

A sigma bond is stronger than $$\pi$$ bond

A double bond is stronger than a single bond

A double bond is shorter than a single bond

Solution

Question 3

9 sigma bonds, 1 pi bond and 2 lone pairs

8 sigma bonds, 2 pi bond and 2 lone pairs

10 sigma bonds, 1 pi bond and 1 lone pair

9 sigma bonds, 2 pi bond and 1 lone pair

Solution

Question 4

$$ S_{3}O_{9} $$ : contains no S-S linkage

$$ S_{2}O^{2}_{6 } $$ ; contains -O-O-linkage

$$ (HPO_{3})_{3} $$; contains P-P linkage

$$ S_{2}O^{2-}_{8} $$ ; contains S-S linkage

Solution

Question 5

Sidewise as well as end to end overlap of orbitals take place

Sidewise overlap of orbitals take place

End to end overlap of orbitals takes place

None of the above

Solution

Question 6

One $$\sigma$$ and Two $$\pi$$

One $$\sigma$$ and one $$\pi$$

Two$$\sigma$$ and one$$\pi$$

Three $$\sigma$$ bonds.

Solution

Question 7

One sigma, one pi

One sigma, two pi

Two sigma, one pi

Two sigma, Two pi

Solution

Question 8

$$ H_{2}PO_{2} $$, $$ H_{3}PO_{3} $$,$$ H_{3}PO_{4} $$ all are tribasic and reducing in nature

Among anions, $$ NO_{3}^{-} $$, $$ SO^{2-}_{3} $$,$$ SO^{2-}_{4} $$,$$ S_{2}O_{4}^{2-} $$,$$ H_{2}SO_{4} $$ , $$ SO^{2-}_{3} $$ is basic reducing nature

Number of anions $$ SO^{2-}_{3} $$,$$ SO^{2-}_{4} $$, $$ SO^{2-}_{4} $$, and $$ H_{2}SO_{4} $$,$$ SO^{2-}_{3} $$

Number of lone pair(s) electrons on Xe atoms in $$ XeF_{2} $$,$$ XeF_{4} $$,$$ XeF_{6} $$ are 3,2,and 1 respectively.

Solution

Question 9

Two sigma bonds at right angles to each other

One sigma bond and one pi bond

Two pi bonds at right angles to each other

Two pi bonds at an angle of $$60^{\circ}$$ to each other

Solution

Question 10

A meson

A proton

An ion

A cyclotron

Solution

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