Four aqueous solutions are prepared: (P) 0.100 mol kg^-1 glucose, (Q) 0.040 mol kg^-1 NaCl, (R) 0.035 mol kg^-1 Al2(SO4)3, (S) 0.045 mol kg^-1 Na3PO4. Assume the three salts are completely dissociated. The correct order of increasing boiling point is

JEE Advanced levelSingle correct optionDifficulty 3 of 3so208

Four aqueous solutions are prepared: (P) $0.100 mol k g^{- 1}$ glucose, (Q) $0.040 mol k g^{- 1}$ $NaCl$ , (R) $0.035 mol k g^{- 1}$ $Al X_{2} (SO X_{4}) X_{3}$ , (S) $0.045 mol k g^{- 1}$ $Na X_{3} PO X_{4}$ . Assume the three salts are completely dissociated. The correct order of increasing boiling point is

Boiling point elevation follows

i m

(same solvent). P:

1 \times 0.100 = 0.100

; Q:

2 \times 0.040 = 0.080

; R:

Al X_{2} (SO X_{4}) X_{3}

gives 5 ions,

5 \times 0.035 = 0.175

; S:

Na X_{3} PO X_{4}

gives 4 ions,

4 \times 0.045 = 0.180

. The order is Q

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