Question 1

Find the correct statement:&#10;A) The stability of +1 oxidation state increases down Group 13.&#10;B) The stability of +3 oxidation state increases down Group 13.&#10;C) There is no clear trend in the stability of oxidation states in Group 13.

Accepted Answer

The stability of the +1 oxidation state indeed increases down Group 13 due to the inert pair effect, which makes it harder for the outermost s-electrons to participate in bonding as you move down the group.

Question 2

Find the correct name for B₅H₉: A) pentaborane-9-hydride B) pentaboranenonahydride C) pentaborane(9)

Accepted Answer

The correct name for B₅H₉ is pentaborane(9), which follows the nomenclature rules for boranes, indicating the number of boron and hydrogen atoms in the compound.

Question 3

Which of the following boron compounds is not planar? A) BF₃ B) B₂F₄. C) B₄Cl₄.

Accepted Answer

B₄Cl₄ (Borane-tetrachloride, BCl4-) is not planar due to its tetrahedral geometry.

Question 4

Different borate structures are composed of these two simple structural building blocks:&#10;A) three coordinate and five coordinate boron-oxygen species&#10;B) three coordinate and four coordinate boron-oxygen species&#10;C) four coordinate and five coordinate boron-oxygen species

Accepted Answer

Borate structures are primarily composed of three-coordinate boron linked to three oxygen atoms and four-coordinate boron linked to four oxygen atoms. These configurations are fundamental to the formation of various borate minerals and compounds.

Question 5

Find the correct statement:&#10;A) B-N compounds are more reactive than analogue organic compounds.&#10;B) B-N compounds are less polar than analogue organic compounds.&#10;C) Cubic BN is harder than diamond.

Accepted Answer

B-N compounds are more reactive than analogue organic compounds because the B-N bond is weaker than the C-C bond.

Question 6

Suggest the structure for B₅H₉: A) closo B) nido C) arachno

Accepted Answer

The structure is nido because the formula follows the nomenclature for boranes, where the formula B₅H₉ indicates a borane with one less vertex than a closo-structure, which is characteristic of nido-structures.

Question 7

Find the most hydridic hydride. A) B₂H₆ B) AlH₃ C) GaH₃

Accepted Answer

The answer of Find the most hydridic hydride. A) B₂H₆ B) AlH₃ C)...

Question 8

What do BCl₃ and AlCl₃ have in common? A) Both are strong Lewis acids. B) Both are ionic compounds. C) Both dissolve little in water.

Accepted Answer

Both BCl3 and AlCl3 are strong Lewis acids because they can accept electron pairs due to the electron deficiency of the central atom.

Question 9

Find the correct statement: A) Al⁺ is a strong reducing agent while Tl³⁺ is a strong oxidizing agent. B) Both Al³⁺ and Tl³⁺ are oxidizing. C) Al₂O and Tl₂O are both very stable compounds.

Accepted Answer

Al⁺ is a strong reducing agent due to its low ionization energy and high hydration energy. Tl³⁺ is a strong oxidizing agent due to its high ionization energy and low hydration energy.

Question 10

Why are compounds formed between elements of Group 13 and Group 15 important?&#10;A) All of them are very hard materials.&#10;B) They are semiconductors.&#10;C) They are important raw materials.

Accepted Answer

Compounds formed between elements of Group 13 and Group 15, such as gallium arsenide, are important because they are semiconductors, which are crucial in the electronics industry.

Deck 13: The Group 13 Elements