quiz group 1

What is the molecular geometry of water (H₂O), and why is it polar?

• Linear; because the bonds are nonpolar

• Bent; due to lone pairs on oxygen

• Tetrahedral; due to hybrid orbitals

• Trigonal planar; due to equal electronegativity

What is the bond angle in methane (CH₄) and what is its molecular geometry?

• 90°, square planar

• 109.5°, tetrahedral

• 120°, trigonal planar

• 180°, linear

What is the bond angle in ammonia, NH3

and what is its molecular geometry?

• 109.5°, tetrahedral

• 104.5°, bent

• 107°, trigonal pyramidal

• 120°, trigonal planar

Which type of hybridization is present in nitrogen in the molecule NH3?

​

• sp

• sp²

• sp³

• sp³d

What happens to the bond angle in NH3

when it forms the ammonium ion

NH4+ ?

A) It increases from 107° to 109.5°

B)It decreases from 109.5° to 104.5°

C) It remains the same at 107°

D) It decreases to 90°

Answer: A) It increases from 107° to 109.5°

• It increases from 107° to 109.5°

• It decreases from 109.5° to 104.5°

• It remains the same at 107°

• It decreases to 90°

draw arrow of the dipole moment for NH3

How many structural isomers exist for pentane (C5_55​H12_{12}12​)?

a) 2
b) 3
c) 4
d) 5

• 2

• 3

• 4

• 5

Which of the following is a branched isomer of pentane?

a) n-Pentane
b) Pentane
c) 2-Methylbutane
d) Hexane

• n-Pentane

• Pentane

• 2-Methylbutane

• Hexane