1
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be $$-$$0.93$$^\circ$$C (Kf(H2O) = 1.86 K kg mol$$-$$1). The number (n) of benzoic acid molecules associated (assuming 100% association) is ___________.
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2
JEE Main 2021 (Online) 26th February Morning Shift
Numerical
+4
-1
224 mL of SO2(g) at 298 K and 1 atm is passed through 100 mL of 0.1 M NaOH solution. The non-volatile solute produced is dissolved in 36g of water. The lowering of vapour pressure of solution (assuming the solution in dilute) (P$$_{({H_2}O)}^o$$ $$-$$ 24 mm of Hg) is x $$\times$$ 10$$-$$2 mm of Hg, the value of x is ___________. (Integer answer)
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3
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____________ molal. (Rounded off to the nearest integer)

[Kb = 0.52 K kg mol$$-$$1]
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4
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
1 molal aqueous solution of an electrolyte A2B3 is 60% ionised. The boiling point of the solution at 1 atm is _________ K. (Rounded off to the nearest integer)

[Given Kb for (H2O) = 0.52 K kg mol$$-$$1]
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