Question 1

Which of the following best explains why elements in the Boron family (Group 3A) typically do not react with water under standard conditions?

Accepted Answer

They form a protective oxide layer that inhibits reaction with water.

Question 2

What is the balanced chemical equation for the reaction of gallium (Ga) with water ($$\mathrm{H_2O}) as $$shown in the study material?

Accepted Answer

$$2\ \mathrm{Ga} (s) + 6\ \mathrm{H_2O} (l) \rightarrow 2\ \mathrm{Ga(OH)_3} (aq) + 3\ \mathrm{H_2$} (g)$$

Question 3

When strontium reacts with aqueous chlorine, what is the product formed?

Accepted Answer

$$\mathrm{$$SrCl_2$$}$$

Question 4

Which of the following is a general equation for the reaction of a Group 2A metal ($$\mathrm{M}) $$with water?

Accepted Answer

$$\mathrm{M} (s) + 2\ \mathrm{H_2O} (l) \rightarrow \mathrm{M(OH)_2} (aq) + \mathrm{H_2$} (g)$$

Question 5

What is the oxidation state of gallium in $$\mathrm{Ga(OH)_3}$$ formed during its reaction with water?

Accepted Answer

+3

Question 6

Which of the following best describes the trend in reactivity of Group 2A metals with water as you move down the group?

Accepted Answer

Reactivity increases due to decreasing ionization energy.

Question 7

A student mixes $$\mathrm{2Al} (s) $$with $$3Cl_2 (g). $$What is the balanced equation and product?

Accepted Answer

$$2\ \mathrm{Al} (s) + 3\ \mathrm{Cl_2$} (g) \rightarrow 2\ \mathrm{$$AlCl_3$$} (s)$$

Question 8

Which statement correctly describes the products when a Group 2A metal reacts with a halogen?

Accepted Answer

A metal halide is formed, with the metal in a +2 oxidation state.

Question 9

Which of the following equations represents the reaction of aluminum with water under standard conditions?

Accepted Answer

$$2\ \mathrm{Al} (s) + 6\ \mathrm{H_2O} (l) \rightarrow 2\ \mathrm{Al(OH)_3} (aq) + 3\ \mathrm{H_2$} (g)$$

Question 10

Which property of Group 2A metals makes them more reactive with halogens compared to water?

Accepted Answer

Halogens are strong oxidizing agents, facilitating electron transfer from the metal.

Question 11

If $$\mathrm{2Al}$$ reacts with $$3Br_2$$, what is the product?

Accepted Answer

$$2\ \mathrm{$$AlBr_3$$}$$

Question 12

Which of the following is a correct statement about the valence electrons of Boron family elements?

Accepted Answer

They have 3 valence electrons in the s and p subshells.

Question 13

Which of the following best describes the type of reaction when a Group 2A metal reacts with a halogen?

Accepted Answer

Redox reaction resulting in the formation of an ionic compound.

Question 14

A patient accidentally ingests a large amount of barium chloride ($$\mathrm{$$BaCl_2$$}). $$Which property of $$\mathrm{$$BaCl_2$$}$$ makes it dangerous?

Accepted Answer

It is highly soluble in water and releases toxic $$\mathrm{Ba$$^{2+}$$}$$ ions.

Question 15

Which of the following is the correct balanced equation for the reaction of magnesium with chlorine gas?

Accepted Answer

$$\mathrm{Mg} (s) + \mathrm{Cl_2$} (g) \rightarrow \mathrm{$$MgCl_2$$} (s)$$

Question 16

Which of the following is a common misconception about the reactivity of Group 2A metals?

Accepted Answer

Their reactivity with water increases as you move down the group.

Question 17

Which of the following best describes the role of halogens in reactions with Group 2A metals?

Accepted Answer

Halogens act as oxidizing agents, accepting electrons from the metal.

Reactivity of the Boron Family (Group 13) Elements: Reactions with Water and Halogens

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