JEE Main 2026 · 5 Apr · Shift 1 · Chemistry Q54

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ChemistrySingle correct+4 / -1Question 54 of 75

What is the mole fraction of water in 10% by weight (w/w) of aqueous urea solution?
[Given: Molar mass of H, O, C and N are 1, 16, 12 and 14 g mol $^{-1}$ respectively.]

0.825

0.032

0.867

0.967

Answer and worked solution

Official answer: D

Take 100 g of solution. Urea: 10 g, or $\tfrac{10}{60}=0.167$ mol. Water: 90 g, or 5 mol.

Mole fraction of water.
$x=\frac5{5.167}\approx0.967.$

(D)

Topics:Concentration terms

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JEE Main 2026 · 5 Apr · Shift 1, Chemistry question 54