Question

Please add explanation if you can

Q1)   What is the formal charge on each atom in dichloromethane, CH₂Cl₂?

	a.	C atom = 0, each H atom = 0, and each Cl atom = 0
	b.	C atom = –2, each H atom = +1, and two Cl atoms = 0
	c.	C atom = +4, each H = –1, and each Cl atom = –1
	d.	C atom = +4, each H = +1, and each Cl atom = –1
	e.	C atom = –4, each H = +1, and each Cl atom = +1

Q2)   The Lewis structure of which of the following formula violates the octet rule?

a.

SiF6

b.

NF3

c.

OF2

d.

HF

e.

SiF4

Q3)   Which of the following has an incomplete octet in its Lewis structure?

a.

SO2

b.

F2

c.

ClO2

d.

ICl

e.

CO2

Q4)   When you draw the Lewis structure for PF₂Cl₃, how many single bonds, double bonds, and lone pair electrons reside on the central phosphorus atom?

	a.	5 single bonds, 0 double bonds, 0 lone pairs
	b.	4 single bonds, 1 double bond, 0 lone pairs
	c.	5 single bonds, 0 double bonds, 1 lone pair
	d.	4 single bonds, 1 double bond, 1 lone pair
	e.	3 single bonds, 2 double bonds, 0 lone pairs

Q5)   What is the molecular geometry around an atom in a molecule or ion which is surrounded by one lone pair of electrons and three single bonds. a. trigonal pyramidal b. tetrahedral c. linear d. bent e. trigonal planar

Q6)   What is the electron-pair geometry around an atom in a molecule or ion which is surrounded by zero lone pairs of electrons and five single bonds. a. trigonal bipyramidal b. see-saw or distorted tetrahedron c. T-shaped d. linear e. trigonal planar
Q7)   Use VSEPR theory to predict the molecular geometry around the nitrogen atom in nitrite ion, NO2–. a. trigonal-planar b. tetrahedral c. trigonal-pyramidal d. T-shaped e. bent

Q8)   What are the approximate H−N−H bond angles in NH₄⁺?

	a.	109.5°
	b.	120°
	c.	109.5° and 120°
	d.	90°
	e.	90° and 120°

Q9)   In molecules, as bond order increases,

	a.	both bond length and bond energy increase.
	b.	both bond length and bond energy decrease.
	c.	bond length increases and bond energy is unchanged.
	d.	bond length is unchanged and bond energy increases.
	e.	bond length decreases and bond energy increases.

Q10)   Use Lewis structures to predict the bond order for a sulfur-oxygen bond in SO₃?

a.

1

b.

3/2

c.

4/3

d.

2

e.

5/2