Test: Chemical Bonding- 2 - Chemistry MCQ

Isoelectronic species are those have same number of electrons.

Sulfur forms discrete polyatomic molecule as in S8

Carbon forms discrete polyatomic molecules as in diamond, etc.

The correct answer is Square Planar. The structure of XeF4 is Square Planar. This is because XeF4 follows the VSEPR theory, and the two lone pairs of electrons in XeF4 are placed in a plane that is perpendicular inside an octahedral setting. They face opposite to each other, which is at a distance of 180°. This is the sole reason for the square planar shape of xenon tetrafluoride.

In TeCl₄ out of 6 electrons:bonded electrons are 4,non-bonded electron pair is 1.
In ClF₃ out of 7 electrons:bonded electrons are 3,non-bonded electron pairs are 2.
In PCl₃ out of 5 electrons:bonded electrons are 3,non-bonded electron pair is 1.
In ICl₂− out of (7+1=8) electrons:bonded electrons are 2,non-bonded electron pairs are 3.

Both CO (6 + 8=14) and CN^– (6 + 7+1= 14) have the same electrons. so they are iso-electronic with each other.

The atoms in molecular covalent molecules are held together by strong covalent bonds. Although these bonds are strong, there are only weak forces of attraction between molecules. These weak attractive forces are called van der Waal’s forces and can be broken with little energy.

Pi bond electrons don’t contribute when we calculate the hybridization. So due to one sigma bond and one lone pair hybridization will be “sp”.

Hence D is correct.

The state of hybridization of boron and oxygen atom in boric acid (H₃​BO₃​) is sp²,sp³  respectively.

Boric acid ; has a network structure in which boron is trigonal having sp² and each oxygen atom is tetrahedral having sp³-hybridization with two lone pair of electrons on oxygen.

PCl₃ has sp³-hybridised phosphorus, with one lone pair. Therefore, molecule has pyramidal shape like ammonia.