Chemical Bonding and Molecular Structure Test 20

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Chemical Bonding and Molecular Structure Test 20

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the of the following molecules is expected to have zero dipole moment?

A
$$H_2O$$

B
$$CO_2$$

C
$$SO_2$$

D
$$CaF_2$$

Solution
Question 2
1 / -0

The number of P-O-P and P-O-H bonds present respectively in pyrophosphoric acid molecule are_____

A
1,2

B
2,2

C
1,4

D
1,8

Solution
Question 3
1 / -0

How many sigma and pi bonds are there in tetracyano ethylene molecule?

A
$$9\sigma $$ and $$9\pi$$

B
$$9\sigma $$ and $$7\pi$$

C
$$5\sigma $$ and $$9\pi$$

D
$$5\sigma $$ and $$7\pi$$

Solution
Question 4
1 / -0

The valency of carbon is four. On what principle it can be explained in a better way?

A
Resonance

B
Hybridization

C
Electron transfer

D
None of the above

Solution

Carbon has only two unpaired electrons by its configuration but hybridization is a concept by which we can explaning its valency 4.
Question 5
1 / -0

Two $$\pi$$ and half $$\sigma$$ bonds are present in:

A
$$N_2^+$$

B
$$N_2$$

C
$$O_2^+$$

D
$$O_2$$

Solution

$$N_2^{\oplus} \Longrightarrow BO = 2.5 \Longrightarrow \left[ \pi - Bond = 2 \& \sigma - Bond = \dfrac{1}{2}\right]$$
$$N_2 \Longrightarrow B.O. = 3.0 \Longrightarrow [\pi - Bond = 2 \& \sigma - Bond = 11]$$
$$O_2^{\oplus} = B.O. \Longrightarrow 2.5 \Longrightarrow [\pi-Bond = 1.5 \& \sigma - Bond = 11]$$
$$O_2 \Longrightarrow 2 \Longrightarrow [\pi - Bond \Longrightarrow 1 \& \sigma - Bond = 11]$$
Question 6
1 / -0

The hybridisation of $$S$$ in $$SF_6$$ molecule is

A
$$sp^3$$

B
$$sp^3d^2$$

C
$$sp^3d$$

D
None

Solution

Sulphur forms $$6$$ bond pairs. It thus needs $$6$$ hybrid orbitals and therefore, hybridization is $$sp^3d^2$$this molecule has octahedral structure.
Question 7
1 / -0

Which one of the following compounds has permanent dipoles?

A
$$CH_4$$

B
$$CO_2$$

C
$$HCl$$

D
$$H_2$$

Solution
Question 8
1 / -0

The dipole moment of $$HBr$$ is $$2.6 \times {10^{ - 30}}cm$$ and the interatomic spacing $$1.41\,A^\circ $$. The percentage of ionic in $$HBr$$ is

A
$$10.5$$

B
$$13.5$$

C
$$12.5$$

D
$$11.5$$

Solution
Question 9
1 / -0

Which of the following is not $$sp^3$$ hybridise

A
$$BH_3$$

B
$$BH^-_4$$

C
$$NH_4^+$$

D
$$NH_3$$

Solution

$$BH_3 \to Sp^2$$ $$NH_4^+ \to Sp^3$$
$$BH_4^- \to Sp^3$$ $$NH_3 \to Sp^3$$
Question 10
1 / -0

The molecule which does not exibit dipole moment is :

A
$$N{H_3}$$

B
$$CHC{l_3}$$

C
$${H_2}O$$

D
$$CC{l_4}$$

Solution