Chemical Bonding and Molecular Structure Test 52

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Chemical Bonding and Molecular Structure Test 52

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Weekly Quiz Competition

Question 1
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A diatomic molecule has a dipole moment of $$1.2 D$$ if its bond distance is $$1.0 \mathring{A}$$. What fraction of an electronic charge e exists on each atom?

A
$$20\%$$ of e

B
$$21\%$$ of e

C
$$19\%$$ of e

D
$$25\%$$ of e

Solution
Question 2
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Which of the following molecule/species is having minimum number of lone pair on its central atom?

A
$$BrF_3$$

B
$${BrF_4}^-$$

C
$${XeF_5}^+$$

D
$${I_3}^-$$

Solution
Question 3
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In which of the following molecules are all the bonds not of equal length?

A
$$BCl_3$$

B
$$PF_5$$

C
$$CF_4$$

D
$$SF_6$$

Solution
Question 4
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In $$OF_2$$, the number of bond pairs and lone pairs of electrons is, respectively:

A
$$2, 6$$

B
$$2, 8$$

C
$$2, 10$$

D
$$2, 9$$

Solution
Question 5
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Which of the following would have a permanent dipole moment?

A
$$ SiF_4 $$

B
$$ SF_4 $$

C
$$ XeF_4 $$

D
$$ BF_3 $$

Solution

0
Question 6
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In $$ OF_2 $$ number of bond pairs and lone pairs of electrons are:

A
2, 6

B
2, 8

C
2, 10

D
1, 9

Solution

In $$OF_2$$ molecule, the total number of bond pairs and lone pairs of electrons present is 2 and 8. There are two bond pairs of electrons which form two $$O-F$$ pairs. $$O$$ atom has two lone pairs of an electron. Each $$F$$ atom has 3 lone pairs of electrons. Thus in total, there are 8 lone pairs of electrons.

Hence the correct answer is option B.
Question 7
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An example of molecule having a three center bond is:

A
$$NH_3$$

B
$$ H_3 BO_3 $$

C
$$ NaBH_4 $$

D
$$ B_2H_6 $$

Solution

A three-center two-electron bond is an electron deficient chemical bond where three atoms share two electrons. The combination of three atomic orbitals form three molecular orbitals: one bonding, one non-bonding, and one anti-bonding.

The two electrons go into the bonding orbital, resulting in a net bonding effect and constituting a chemical bond among all three atoms. In many common bonds of this type, the bonding orbital is shifted towards two of the three atoms instead of being spread equally among all three. The simplest example of a 3c-2e bond is in the $$B_2H_6$$. Hence correct answer is option D.
Question 8
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$$ BeF_2 $$ has zero dipole moment whereas $$ H_2O $$ has a dipole moment because:

A
water is linear

B
$$ H_2O $$ is bent

C
F is more electronegative than O

D
hydrogen bonding is present in $$ H_2 O $$

Solution

$$BeF_2$$ is linear and hence it has zero dipole moment. But $$H_2O$$ is bent molecule and hence it has a non-zero dipole moment.

Hence correct answer is option B.
Question 9
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How many bonds are there in

A
$$ 14 \sigma , 8 \pi $$

B
$$ 18 \sigma , 8 \pi $$

C
$$ 14 \sigma , 2 \pi $$

D
$$ 19 \sigma , 4 \pi $$

Solution

There are $$9$$ carbon-carbon $$\sigma$$ bond and $$10$$ carbon-hydrogen $$\sigma$$ bond. So in total, there are $$19\sigma$$ bonds.

Also, there are $$4$$ cabon-carbon $$\pi$$ bond.

So the given molecule contains $$19\sigma$$ bond $$4\pi$$ bond.
Question 10
1 / -0

In $$ NO_3^- $$ ion, number of bond pairs and lone pairs of electrons on nitrogen atom are -

A
2, 2

B
3, 1

C
1, 3

D
4, 0

Solution

In $$NO_3^-$$ ion, due to the presence of one negative charge, number of valence electrons $$=5+1=6$$
One $$O-$$atom forms two bonds and two $$O-$$atom are shared with two electrons of $$N-$$atom
Thus, $$3$$ $$O-$$atoms are shared with $$8$$ electrons of $$N-$$atom.
Number of bond pairs (or shared pairs) $$=4$$
Number of lone pairs $$=0$$
Hence correct answer is option D.