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In a binary system of A and B, a liquid of 20% A (80% B) is coexisting with a solid of 70% A (30% B). For an overall composition having 40% A, the fraction of solid is

1. (A) 0.40
2. (B) 0.50
3. (C) 0.60
4. (D) 0.75

Correct answer: (A) 0.40

Solution

By the lever rule, fraction of solid = (overall - liquid)/(solid - liquid) = (40-20)/(70-20) = 20/50 = 0.40. The stored value 0.50 is incorrect.

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