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Explanation / Answer

Boiling point of a solution increases as the concentration of ions or particles in the solution increases.

NaCl -----> Na+ + Cl-

So, the concentration of particles in 0.1 m NaCl is 2x(0.1 m) = 0.2 m

Na2SO4 ------> 2 Na+ + SO42-

So, the concentration of particles in 0.3 m Na2SO4 is 3x(0.3 m) = 0.9 m

0.7 m glucose containts 0.7 m particles becuase glucose is the one particles in that solution.

BaCl2   -----> Ba2+ + 2Cl-

So, the concentration of particles in 0.4 m BaCl2 is 3x(0.4 m) = 1.2 m

So, the order of increasing boiling point is 0.1 m NaCl < 0.7 m glucose < 0.3 m Na2SO4 < 0.4 m BaCl2

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