Chemical Bonding and Molecular Structure Test

Result

Chemical Bonding and Molecular Structure Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Why does BeF₂ have zero dipole moment whereas H₂O has a positive dipole moment?

A
Because H₂O is a linear molecule

B
Because O is more electronegative than F

C
Because H₂O is a bent shape molecule

D
Because hydrogen bonding is present in H₂O

Solution

The BeF₂ molecule is linear and non-polar. Bonds are polar, but equivalent force acting on Be with 180^o angle is zero. So, the molecule is non-polar.
The molecular geometry of H₂O is bent with asymmetric charge distribution about the central oxygen atom. Therefore, this molecule is polar.
Question 2
1 / -0

To which one of the following pairs does CO₂ resemble in structure?

A
HgCl₂, C₂H₂

B
HgCl₂, SnCl₄

C
C₂H₂, NO₂

D
N₂O, NO₂

Solution

CO₂ →  O = C = O
HgCl₂ →  Cl - Hg - Cl
C₂H₂ →  H - C ≡ C - H
Hence, all possess linear structure.
Question 3
1 / -0

Identify the isostructural pair.

A
NF₃and NO₃^-

B
NF₃and H₃O⁺

C
BF₃ and NF₃

D
N₃H and BF₃

Solution

In H₃O⁺, the central oxygen atom is sp³ hybridised and one of the orbitals is occupied by a lone pair. So, the molecule is pyramidal and isostructural with NF₃. Thus, option (2) is correct.
In NF₃, the central atom N is sp³ hybridised but one of the orbitals is occupied by a lone pair. So, the molecule is pyramidal. In NO₃^- ion, the central N atom is sp²hybridised and the molecule is triangular planar. Thus, option (1) is incorrect.
In BF₃, the central B atom is sp² hybridised and the molecule is planar triangular. NF₃ is pyramidal. Thus, option (3) is incorrect.
N₃H is a bent molecule with three N atoms lying in a line and the N-H bond lying at an angle with N-N-N. So, it is not isostructural with BF₃,which is planar triangular.