Chemical Bonding and Molecular Structure Test 29

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Chemical Bonding and Molecular Structure Test 29

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Weekly Quiz Competition

Question 1
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Number of lone pairs of electrons on Xe atoms in $$XeF_2, XeF_4$$ and $$XeF_6$$ moleculaes are respectively :

A
3, 2 and 1

B
4, 3 and 2

C
2, 3 and 1

D
3, 2 and 0

Solution

$$XeF_2$$ is linear in shape having 3 lone pairs and 2 bond pair electrons.

$$XeF_4$$ is square planar in shape having 2 lone pairs and 4 bond pair electrons.

$$XeF_6$$ is pentagonal pyramidal in shape having 1 lone pair and 6 bond pair electrons.
Question 2
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Which of the following bonds is the weakest?

A
$$Si-Si$$

B
$$Si-O$$

C
$$Si-Cl$$

D
$$Si-H$$

Solution

The $$Si-Si$$ bond is weaker than $$Si-O$$, $$Si-Cl$$, $$Si-H$$ is simply that because the Si atom is bigger than the $$O, Cl, H$$ atom. The electrons forming the bond are farther from the nuclei and don't lower their energy as much by forming the bond.
So, the answer is option $$A$$.
Question 3
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The number of lone pairs and the number of $$S-S$$ bonds in $$S_{8}$$ molecules are respectively:

A
$$8,8$$

B
$$16,8$$

C
$$8,16$$

D
$$8,4$$

Solution
Question 4
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How many $$P-O$$ bonds and how many lone pairs respectively are present in $$P_4O_6$$ molecule?

A
$$12, 4$$

B
$$8, 8$$

C
$$12, 16$$

D
$$12, 12$$

Solution

From the structure of $$P_4O_6$$, we can count the number of $$P-O$$ bonds and the total number of lone pairs in the molecule. Each $$P$$ atom is bonded to 3 oxygen atom, hence there are 12 $$P-O$$ bonds are present.
Each oxygen has 2 lone pairs and each phosphorus has one lone pair. Hence, total 16 lone pairs are present in $$P_4O_6$$,

Hence, the answer is option $$C$$.
Question 5
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The number of sigma and pi bonds in peroxydisulphuric acid are respectively:

A
$$9$$ and $$4$$

B
$$11$$ and $$4$$

C
$$4$$ and $$8$$

D
$$4$$ and $$9$$

Solution
Question 6
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In which of the following ions, there is no $$S-S$$ bond?

A
$$S_{2}O_{4}^{2-}$$

B
$$S_{2}O_{6}^{2-}$$

C
$$S_{2}O_{2}^{2-}$$

D
$$S_{2}O_{3}^{2-}$$

E
$$S_{2}O_{7}^{2-}$$

Solution
Question 7
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Which of the following ions does not have S-S linkage?

A
$$ S_{2}O_{8}^{2-}$$

B
$$ S_{2}O_{6}^{2-}$$

C
$$ S_{2}O_{5}^{2-}$$

D
$$ S_{2}O_{3}^{2-}$$

Solution

The structures of following ions are shown in figure.

Option A is correct.
Question 8
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Directions For Questions

Xenon having nearly the same ionisation energy as oxygen forms a larg number of compounds like xenon fluorine, oxyfluorides oxides and perxenates. Xenon exhibits various oxidation states from $$+2$$ to $$+8$$. Perxenates are powerful oxidants and $$XeO_3$$ is a powerful explosive.

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The number of lone pairs of electrons in $$XeF_2, XeF_4, XeF_6$$ and $$XeOF_2$$ are respectively:

A
$$3,2,1,2$$

B
$$2,1,1,2$$

C
$$3,2,1,1$$

D
$$3,2,2,2$$

Solution
Question 9
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In $$Fe(CO)_5$$, the $$Fe-C$$ bond posses:

A
$$\pi$$ character only

B
$$\sigma$$ character only

C
ionic character only

D
bond $$\pi$$ and $$\sigma$$ characters

Solution
Question 10
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$$M-L$$ bonds in carbonyl possess:

A
only sigma character

B
only pi $$(\pi)$$ character

C
both sigma $$(\sigma)$$ and pi $$(\pi)$$ characters

D
none of the above

Solution

The formation of a metal-carbon σ bond takes place because of the donation of electrons by the carbonyl molecules.They donate it to the vacant orbitals of the metal. This is one way of formation of the metal carbonyls.

The other form is the creation of a metal-carbon $$\pi$$ bond because of the donation of a pair of electrons from a filled d orbital metal into the vacant antibonding $$\pi^{*}$$ orbital of carbonyl ligand.