Statement:\nMethylated spirit contains methyl alcohol, which is poisonous.\n\nConclusions:\nI. Ethyl alcohol is beneficial.\nII. Methylated spirit is poisonous.

Introduction / Context:
This Statement–Conclusion item asks whether each stated conclusion logically follows from the single premise: “Methylated spirit contains methyl alcohol, which is poisonous.” The task is not to bring outside facts but to examine what necessarily follows from the wording provided. The key idea is containment and property inheritance: if a product contains a poisonous constituent in meaningful proportion, the product is generally regarded as poisonous for human consumption.

Given Data / Assumptions:

• Methylated spirit contains methyl alcohol.
• Methyl alcohol is poisonous.
• No statement is made about ethyl alcohol or its benefits/harms.

Concept / Approach:
In logic puzzles of this type, a conclusion “follows” only if it is directly entailed by the given statement. Conclusion I introduces a new substance (ethyl alcohol) and a new attribute (“beneficial”) that is not discussed in the premise; therefore we must treat I as unsupported. Conclusion II attributes poison to methylated spirit based on its poisonous component. Since the statement explicitly declares that a poisonous substance is an ingredient of methylated spirit, and such products are treated as poisonous for ingestion, II is supported.

Step-by-Step Solution:
1) Identify the property: “poisonous” belongs to methyl alcohol.2) Apply to the mixture: methylated spirit contains that poisonous constituent → product is poisonous for human consumption → II follows.3) Ethyl alcohol is never mentioned; “beneficial” is outside the text → I does not follow.

Verification / Alternative check:
Try negating the supported conclusion: if methylated spirit were not poisonous, the statement that it contains a poisonous alcohol would clash with normal safety reasoning for such mixtures. Thus II is robust. For I, even if ethyl alcohol were harmful or neutral, the original statement remains true; hence I is not entailed.

Why Other Options Are Wrong:
“Either” or “Both” would accept an unrelated claim about ethyl alcohol. “Neither” ignores the clear implication regarding methylated spirit.

Common Pitfalls:
Dragging in general chemistry knowledge about ethanol’s effects or uses—none of which appear in the premise.

Final Answer:
If only conclusion II follows.