DAT Question of the Day

Correct Answer: D. Group 18 (VIIIA or O) – Inert Gases

The Group 18 (VIIIA or O) – Inert Gases elements, He, Ne, Ar, Kr, Xe and Rn are all monatomic, chemically unreactive gases that possess the stable electron configurations that all Representative elements try to attain by undergoing chemical reactions.

The alkali Metals, Alkaline Earth Metals and Halogens are all chemically active and react in such ways as to attain the same number of electrons as their nearest Inert Gas.

The Transition Metals are not a Group on the Periodic Table, but represent the filling of the 3 – 6 d sub-shells. Their chemistry is not determined by the Inert Gases.

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Correct Answer: A. Br3COH

The strongest acid is the molecule with the most stable conjugate base. In this instance, the tribromomethoxide (A) is the more stable conjugate base by virtue of the three electron withdrawing chlorine atoms (Inductive effect).

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Correct Answer: D. The rate order

“SN” stands for nucleophilic substitution and the “1” represents the fact that the rate-determining step is unimolecular.

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Correct Answer: C. Lead (Pb).

The correct answer is C. First of all, we can immediately disregard answers A, B, and E. Nearly all compounds containing sodium, potassium, or zinc are soluble. Thus, we are left with answers C and D. Of the two, we realize that sulfur does not bind with sulfate. Sulfur sulfate does not exist. Lastly, you could eliminate sulfur by recognizing that it’s a nonmetal, not a metal. We recognize as well that lead compounds are rarely soluble, but lead perchlorate is. Thus, answer C is the correct answer.

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Correct Answer: A. H2SO3

Generally speaking, the equivalence point is the point on a titration curve in which the number of moles of acid is equal to the number of moles of base. In an acid with one proton, there is one equivalence point; however di- and triprotic acids have more than one acidic hydrogen atom. A titration curve with two equivalence points suggests that the acid has two hydrogen atoms. Of the above choices, sulfurous acid (H2SO3) would be the only suitable choice.

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Correct Answer: C. C2H3O

If the compound has twice as much carbon as oxygen, then that means the carbon: oxygen ratio should be 2:1. Then, we are given the information that there is as much hydrogen as there is oxygen and carbon combined. This implies that there should be 3 units of hydrogen, since there are 2 of carbon and one of oxygen. This gives us the empirical formula C2H3O.

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Correct Answer: C. the arrangement of the particles in the solid.

The shape of a crystal is dependent on the arrangement/layout of the particles in the solid. The unit cell is the smallest repeating unit of a crystal that retains the crystals shape. The unit cell can either be simple cubic, body-centered, or face-centered.

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Correct Answer: E. 10.1

The conjugate acid of a strong base is a weak acid, however the conjugate base of a weak acid is a strong base. Therefore, the strong conjugate base (from the weak acid) will drive the pH high into the basic region. We cannot determine the exact pH, but the pH would definitely be basic. The only pH value that signals a basic solution is answer option [D]. You could also solve this question looking at the answer choices. Answer options [A], [B], and [C] are all acidic. Only answer option [E] is basic, and given that there can only be one right answer, it is likely this is the right answer since it’s the odd one out.

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Correct Answer: D. pH of 3 is 1000x stronger than a pH of 6

The pH scale is based on factors of 10, with each unit representing 10. There are 3 pH units between pH 3 and pH 6, therefore the difference in strength of the two acids is 10³ or a 1000 times difference. The lower the pH, the stronger the acid. Thus, an acid with a pH of 3 is 1000x stronger than an acid with a pH of 6.

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