Discussion
Consider the following statements about the phase rule.
1. A mixture of gases constitutes one phase 2. A eutectic mixture is a chemical compound 3. The reduced phase rule applies where pressure is held constant
Answer: B
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: gases mix in all proportions and form a single phase, and the reduced rule is exactly the constant-pressure case. Statement 2 is the standard misconception - a eutectic melts sharply but is a mechanical mixture of two solid phases, not a compound.
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