Chemical Bonding and Molecular Structure Test 53

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Chemical Bonding and Molecular Structure Test 53

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Weekly Quiz Competition

Question 1
1 / -0

The formula charges on three oxygen atoms of ozone molecule are respectively:

A
+1, 0 , + 1

B
0, 0 , 0

C
+1, 0 , -1

D
-1 , +1 , -1

Solution

According to the electron-dot structure, there are 12 number of bonding electrons and 6 number of non-bonding electrons.

Now we have to calculate the formal charges of each oxygen atom.

Formal charge $$=$$ Valence electrons $$-$$ Non-bonding electrons $$-\dfrac{Bonding\,\,electrons}{2}$$

Formal charge on $$O_1=6-2-\dfrac 62=+1$$

Formal charge on $$O_2=6-4-\dfrac 42=0$$

Formal charge on $$O_3=6-6-\dfrac 22=-1$$

Hence the correct answer is option C.
Question 2
1 / -0

The correct order of the O-O bond length in $$ O_2 , H_2 O_2$$ and $$O_3 $$ is:

A
$$ O_3 > H_2O_2 > O_2 $$

B
$$ O_2 > H_2O_2 > O_3 $$

C
$$ O_2 > O_3 > H_2O_2 $$

D
$$ H_2O_2 > O_3 > O_2 $$

Solution

The correct order of O−O bond length is $$H_2O_2>O_3>O_2$$ since the bond length is inversely proportional to bond order.

Hence the correct answer is option D.
Question 3
1 / -0

The electronegativity difference between N and F is greater than between N and H yet the dipole moment of $$ NH_3(1.5 D) $$ is larger than that of $$ NF_3 (0.2 D) $$. This is because:

A
In $$ NH_3 $$ as well as in $$ NF_3 $$ the atomic dipole are in the opposite direction.

B
In $$ NH_3 $$ the atomic dipole and bond dipole are in the opposite directions whereas in $$ NF_3 $$ these are in the same direction.

C
In $$ NH_3 $$ as well as in $$ NF_3 $$ the atomic dipole and bond dipole are in the same direction.

D
In $$ NH_3 $$ the atomic dipole and bond are in the same direction whereas in $$ NF_3 $$ these are in the opposite direction.

Solution
Question 4
1 / -0

Which of the following pairs of moleculae will have permanent dipole moments for both members?

A
$$ SiF_4$$ and $$NO_2 $$

B
$$ NO_2$$ and $$CO_2 $$

C
$$ NO_2$$ and $$O_3 $$

D
$$ SiF_4$$ and $$CO_2 $$

Solution
Question 5
1 / -0

The number of $$P-O-P$$ bonds in cyclic metaphosphoric acid is:

A
zero

B
two

C
three

D
four

Solution
Question 6
1 / -0

$$C-C$$ bond length is maximum in:

A
diamond

B
graphite

C
naphthalene

D
fullerene

Solution
Question 7
1 / -0

Compound $$X$$ is anhydride of sulphuric acid. The number of sigma bonds and $$\pi$$- bonds present in $$X$$ are respectively:

A
$$6$$ and $$6.95$$

B
$$5$$ and $$5.95$$

C
$$3$$ and $$3$$

D
$$4$$ and $$5.92$$
Question 8
1 / -0

Which species has the maximum number of lone pairs of electrons on the central atom?

A
$$ClO_3^-$$

B
$$XeO_4$$

C
$$I_3^-$$

D
$$SF_4$$

Solution
Question 9
1 / -0

Which of the following molecule does not possess a permanent dipole moment?

A
$$H_{2}S$$

B
$$SO_{2}$$

C
$$SO_{3}$$

D
$$CS_{2}$$

Solution
Question 10
1 / -0

Which of the following is a false statement?

A
$$BH_3$$ is not a stable compound

B
Boron hydrides are formed when dil. $$HCl$$ reacts with $$Hg_3B_2$$

C
Al the $$B - H$$ bond distances in$$B_2H_6$$ are equal

D
The boron hydrides are readily hydrolysed

Solution