Chemical Bonding Test

Result

Chemical Bonding Test - 8

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Score
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Rank

Time Taken: -

Question 1/4
1 / -0

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

Correct

Wrong

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

Correct

Wrong

Skipped
B
The contributing structures may have different energies

Correct

Wrong

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

Correct

Wrong

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

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Solutions

Separating opposite charges requires energy. Therefore stability decreases.
Question 2/4
1 / -0

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

Correct

Wrong

Skipped
A
NO^-and CN⁺

Correct

Wrong

Skipped
B
NO⁺ and CN⁺

Correct

Wrong

Skipped
C
CN^– and NO⁺

Correct

Wrong

Skipped
D
CN^– and CN⁺

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Solutions

CN^– and NO⁺ are 14 electrons system having bond order = 3
Question 3/4
1 / -0

In Fe(CO)₅, the Fe — C bond possesses

Correct

Wrong

Skipped
A
ionic character

Correct

Wrong

Skipped
B
σ-character only

Correct

Wrong

Skipped
C
π-character only

Correct

Wrong

Skipped
D
both σ and π characters

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Solutions

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

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

Correct

Wrong

Skipped
A
F₂O > Cl₂O > Br₂O

Correct

Wrong

Skipped
B
F₂O > Br₂O > Cl₂O

Correct

Wrong

Skipped
C
Br₂O > Cl₂O > F₂O

Correct

Wrong

Skipped
D
Cl₂O > Br₂O > F₂O

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Solutions

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.

Question 1/4

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

Question 2/4

NO^-and CN⁺

NO⁺ and CN⁺

CN^– and NO⁺

CN^– and CN⁺

Question 3/4

ionic character

σ-character only

π-character only

both σ and π characters

Question 4/4

F₂O > Cl₂O > Br₂O

F₂O > Br₂O > Cl₂O

Br₂O > Cl₂O > F₂O

Cl₂O > Br₂O > F₂O

Question 1/4

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

Question 2/4

NO- and CN+

NO+ and CN+

CN– and NO+

CN– and CN+

Question 3/4

ionic character

σ-character only

π-character only

both σ and π characters

Question 4/4

F2O > Cl2O > Br2O

F2O > Br2O > Cl2O

Br2O > Cl2O > F2O

Cl2O > Br2O > F2O

NO^-and CN⁺

NO⁺ and CN⁺

CN^– and NO⁺

CN^– and CN⁺

F₂O > Cl₂O > Br₂O

F₂O > Br₂O > Cl₂O

Br₂O > Cl₂O > F₂O

Cl₂O > Br₂O > F₂O