JEE Main 2022 · 27 Jul · Shift 1 · Chemistry Q65

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ChemistrySingle correct+4 / -1Question 65 of 90

Boiling point of a 2% aqueous solution of a non-volatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile solute B. The relation between molecular weights of A and B is

M_A=4M_B

M_B=4M_A

M_A=8M_B

M_B=8M_A

Answer and worked solution

Official answer: B

Equal elevation means equal molality (about the same mass of water): $\frac2{M_A}=\frac8{M_B}$ .

$M_B=4M_A$ . (B)

Topics:Colligative properties

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JEE Main 2022 · 27 Jul · Shift 1, Chemistry question 65