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4. One component of a solution follows Raoult ‘s law over the entire range 0

≤ x1 ≤ 1. The second component must follow Raoult’s law in the range when x2  is

a. Close to zero

b. Close to 1

c.0 ≤ x2 ≤ 0.5

d. 0 ≤ x2 ≤ 1

ANSWER . D

Explanation : When x1   is close to zero then x2  will be close to 1 and vice versa (assuming x1  and  x2   are the mole fractions).

(4)

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