Question 1

What is the molecular shape of XeF₄?

Accepted Answer

XeF4 has a square planar shape due to the arrangement of four fluorine atoms around the central xenon atom, with two lone pairs on the xenon, leading to a symmetric planar structure.

Question 2

How many lone pairs of electrons are left on the Xe atom once it hybridizes to form XeF₄?

Accepted Answer

XeF₄ has a trigonal bipyramidal molecular geometry. The Xe atom has 5 electron domains: one from the lone pair on Xe, 4 from the bonding pairs with F and S. Therefore, Xe undergoes sp3d hybridization to form five hybrid orbitals that are used to form the Xe-F and Xe-S bonds. Since all five electron domains are involved in bonding, there are no lone pairs of electrons left on the Xe atom. Choice (C) is the correct answer.

Question 3

Which of the following statements is/are true of hydrogen under ordinary conditions of temperature and pressure?
1) Hydrogen is a colorless and odorless gas.2. Hydrogen has high molar mass and is polar in nature.3. Hydrogen has a very low boiling point (−253°C) and melting point (−260°C).​

Accepted Answer

Statement 1 is true as hydrogen is a colorless and odorless gas.
Statement 3 is true as hydrogen has a very low boiling point (−253°C) and melting point (−260°C).
Statement 2 is false as hydrogen has a very low molar mass and is nonpolar in nature.

Question 4

Identify the true statement(s) of oxygen. 
1. Oxygen molecules are paramagnetic in nature. 
2. Ozone can be prepared by passing an electrical discharge through water. 
3. Oxidizing power of ozone is greater than that of oxygen.

Accepted Answer

1. Oxygen molecules are paramagnetic, meaning they are attracted to a magnetic field. This is true.
2. Ozone can be prepared by passing an electrical discharge through oxygen, not water. This statement is false, so choice C is not correct.
3. The oxidizing power of ozone is greater than that of oxygen. This statement is true, so choice D is correct.

Question 5

Identify the true statement(s) of Group 8A elements. 
1. The Group 8A elements have filled s and p valence orbitals. 
2. The Group 8A elements are very reactive in nature. 
3. The general electronic configuration of the Group 8A elements is ns2np6, except for helium.

Accepted Answer

1. Group 8A elements, also known as noble gases, have filled s and p valence orbitals, making them chemically inert. 3. Their general electronic configuration is ns2np6, except for helium, which has a 1s^2 configuration.

Question 6

Which of the following statements is/are true of the Group 6A elements?
1. The Group 6A elements react with metals to achieve a noble gas electron configuration. 
2. The Group 6A elements can form covalent bonds with other nonmetals. 
3. The two heaviest members of Group 6A can lose electrons to form cations.

Accepted Answer

The Group 6A elements are highly reactive nonmetals that can form covalent bonds with other nonmetals. They can also react with metals to achieve a noble gas electron configuration. The two heaviest members of Group 6A, polonium and radon, can lose electrons to form cations.

Question 7

Identify the general valence electron configuration of the Group 5A elements.

Accepted Answer

Group 5A elements have a general valence electron configuration of ns²np³, where they have 5 valence electrons.

Quiz 18: The Representative Elements

What is the molecular shape of XeF₄?

How many lone pairs of electrons are left on the Xe atom once it hybridizes to form XeF₄?

Which of the following statements is/are true of hydrogen under ordinary conditions of temperature and pressure? 1) Hydrogen is a colorless and odorless gas.2. Hydrogen has high molar mass and is polar in nature.3. Hydrogen has a very low boiling point (−253°C) and melting point (−260°C) .

Identify the true statement(s) of oxygen. 1. Oxygen molecules are paramagnetic in nature. 2. Ozone can be prepared by passing an electrical discharge through water. 3. Oxidizing power of ozone is greater than that of oxygen.

Identify the true statement(s) of Group 8A elements. 1. The Group 8A elements have filled s and p valence orbitals. 2. The Group 8A elements are very reactive in nature. 3. The general electronic configuration of the Group 8A elements is ns2np6, except for helium.

Identify the general valence electron configuration of the Group 5A elements.

Quiz 18: The Representative Elements

What is the molecular shape of XeF4?

How many lone pairs of electrons are left on the Xe atom once it hybridizes to form XeF4?

Which of the following statements is/are true of hydrogen under ordinary conditions of temperature and pressure? 1) Hydrogen is a colorless and odorless gas.2. Hydrogen has high molar mass and is polar in nature.3. Hydrogen has a very low boiling point (−253°C) and melting point (−260°C) .​

Identify the true statement(s) of oxygen. 1. Oxygen molecules are paramagnetic in nature. 2. Ozone can be prepared by passing an electrical discharge through water. 3. Oxidizing power of ozone is greater than that of oxygen.

Identify the true statement(s) of Group 8A elements. 1. The Group 8A elements have filled s and p valence orbitals. 2. The Group 8A elements are very reactive in nature. 3. The general electronic configuration of the Group 8A elements is ns2np6, except for helium.

Identify the general valence electron configuration of the Group 5A elements.

What is the molecular shape of XeF₄?

How many lone pairs of electrons are left on the Xe atom once it hybridizes to form XeF₄?

Which of the following statements is/are true of hydrogen under ordinary conditions of temperature and pressure? 1) Hydrogen is a colorless and odorless gas.2. Hydrogen has high molar mass and is polar in nature.3. Hydrogen has a very low boiling point (−253°C) and melting point (−260°C) .