Exam 21: Main Group Elements I: Groups 1, 2, 13, and 14

Water treatment using a cation-exchange resin in the H+ form, followed by an anion-exchange resin in the OH- form, unlike the processes using typical zeolites or synthetic resins regenerated by sodium chloride, can produce:

Calculate the number of grams of aluminum produced in the electrolytic process when 2.5 × 10⁵ coulombs are provided to the reaction. Assume 100% efficiency.

Which of the following elements forms a +4 oxidation state that is more stable than its +2 oxidation state, and is also found as a significant component of commercial bronze, pewter, red brass, and most solders?

Finish the following reaction: Li(s) + N₂(g) →

The first ionization potential of calcium is smaller than that of strontium.

Choose the INCORRECT statement.

An aqueous solution of boric acid can be represented by the equilibrium system: B(OH)₃(aq) + 2 H₂O(l) ⇌ H₃O+(aq) + B(OH)₄^-(aq)   [Ka = 5.6 × 10^-10] What is the pH of an eyewash solution which is 0.0018 M in boric acid?

The acidity of the group 3 oxides ________ (increases, decreases, does not change) moving down the group.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Finish the following reaction: Li(s) + O₂(g) →

An amphoteric substance acts as an acid in strongly basic solution and as a base in strongly acidic solution.

Which oxidation state is uncommon for a given element?

What average current must be maintained for a tin plating operation forming 2.4 kg of tin per hour from a solution of a tin(IV) complex, at an electrode efficiency of 90.0%?

Which of the following is used as a water softener?

Which of the following compounds is invoked to demonstrate the inert-pair effect?

Which of the following metals reacts most violently with water?

Which of the following methods are unable to make water soft?

Choose the molecular shape for BCl₃.

Which of the following has more than one allotrope?