Chemical Bonding (4.1 Lewis Structure & 4.2 Molecular Shape)

What is the Lewis symbol of a carbon?

• 
• 
• 
• All are correct

A chemical bond formed by sharing of electrons is

• an ionic bond

• a hydrogen bond

• a covalent bond

• a metallic bond

Which of the following pairs do not form a coordinate bond to each other?

• H₂O and H⁺

• NH₃ and H⁺

• NH₃ and BF₃

• AlCl₃ and H⁺

The Lewis structure of a molecule is shown above. Which group in the Periodic Table does M belongs to?

• Group 14

• Group 15

• Group 16

• Group 18

Elements A and E have two and seven valence electrons respectively. The most likely formula of the compound formed between A and E is

• A₂E

• AE₂

• A₂E₂

• A₂E₇

The Lewis structure of the nitrate ion, NO₃^- is shown above. Nitrogen atom has the exception to the octet rule of

• Incomplete octet

• Expanded octet

• Odd number electron

• None of above

Molecule X have five bonding pairs only around the central atom. The shape of molecule X is best described as

• trigonal planar

• tetrahedral

• trigonal bipyramidal

• octahedral

Choose a false statement.

• Bond length is the distance between a central atom and terminal atom

• Bond angle is the angle of two covalent bonds

• Lone pair is a pair of electrons that are not involved in bonding

• The repulsion of lone pair-lone pair is stronger than lone pair-bonding pair

The bond angle in methane, CH₄ is

(a)  

Choose a correct statement of nitrate ion, NO₃^-.

• The central atom is surrounded by 4 bonding pairs

• The angle between two covalent bonds is 120°

• The length of single bonded N-O is shorter than double bonded N-O

• All atoms obey octet rule, except the double bonded oxygen