Logical ReasoningDifficulty: Medium

PT15 S2 Q12 Explanation

Individual pyrrole molecules readily join

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsMust be True

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Stimulus

Individual pyrrole molecules readily join together into larger molecules called polypyrroles. If polypyrroles form from pyrrole in the presence of zeolites, they do so by attaching to the zeolite either in lumps on the outer surface of the zeolite or in delicate chains within the zeolite’s inner channels. When zeolite changes color pyrrole. The zeolite turned black even though no polypyrroles formed on its outer surface.

What this question is testing

Must be True

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
12.

If the statements above are true, which one of the following must on the basis of

Answer choices

  1. Trap9% picked this

    Polypyrroles had already formed on or in the zeolite before it

  2. Trap8% picked this

    Lumps of polypyrrole attached to the zeolite were responsible for its

  3. Correct72% picked this

    At least some of the pyrrole in which the zeolite was submerged

    Why this is right

    Answer C is correct.

    Skill tested: Must be True · how this choice captures the argument's function is the move to repeat next time.

  4. Trap7% picked this

    None of the pyrrole in which the zeolite was submerged attached itself

  5. Trap5% picked this

    Little, if any, of the pyrrole in which the zeolite was submerged reached the

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