Chemical Bonding Test

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Chemical Bonding Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following conditions is not correct for resonating structures?

A
The contributing structures must have the same number of unpaired electrons

B
The contributing structures may have different energies

C
The contributing structures should be so written that unlike charges reside on atoms that are far apart

D
The positive charge should be present on the electropositive element and the negative charge on the electronegative element

Solution

Separating opposite charges requires energy. Therefore stability decreases.
Question 2
1 / -0

Which one of the following pairs of species have the same bond order?

A
NO^-and CN⁺

B
NO⁺ and CN⁺

C
CN^– and NO⁺

D
CN^– and CN⁺

Solution

CN^– and NO⁺ are 14 electrons system having bond order = 3
Question 3
1 / -0

In Fe(CO)₅, the Fe — C bond possesses

A
ionic character

B
σ-character only

C
π-character only

D
both σ and π characters

Solution

Due to back bonding metal carbonyl complexs get stabilized. Hence both σ and π characters
Question 4
1 / -0

The correct order of X - O - X bond angles is

A
F₂O > Cl₂O > Br₂O

B
F₂O > Br₂O > Cl₂O

C
Br₂O > Cl₂O > F₂O

D
Cl₂O > Br₂O > F₂O

Solution

As the electronegativity of X in X₂O decreases from F to Br, the bond pairs of electrons move closer to the central atom (O) and thus bond pair repulsion increases which increases the X–O–X bond angle. Hence the correct decreasing order of bond angles is Br₂O > Cl₂O > OF₂.

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Chemical Bonding Test - 8

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Chemical Bonding Test - 8

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Question 1

The contributing structures must have the same number of unpaired electrons

The contributing structures may have different energies

The contributing structures should be so written that unlike charges reside on atoms that are far apart

The positive charge should be present on the electropositive element and the negative charge on the electronegative element

Solution

Question 2

NO- and CN+

NO+ and CN+

CN– and NO+

CN– and CN+

Solution

Question 3

ionic character

σ-character only

π-character only

both σ and π characters

Solution

Question 4

F2O > Cl2O > Br2O

F2O > Br2O > Cl2O

Br2O > Cl2O > F2O

Cl2O > Br2O > F2O

Solution

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NO^-and CN⁺

NO⁺ and CN⁺

CN^– and NO⁺

CN^– and CN⁺

F₂O > Cl₂O > Br₂O

F₂O > Br₂O > Cl₂O

Br₂O > Cl₂O > F₂O

Cl₂O > Br₂O > F₂O