1
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
+4
-1
CH4 is absorbed on 1g charcoal at 0$$^\circ$$C following the Freundlich adsorpiton isotherm 10.0 mL of CH4 is adsorbed at 100 mm of Hg, whereas 15.0 mL is adsorbed at 200 mm of Hg. The volume of CH4 adsorbed at 300 mm of Hg is 10x mL. The value of x is _________ $$\times$$ 10-2.

(Nearest integer) [Use log102 = 0.3010, log103 = 0.4771]
2
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
+4
-1
CO2 gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of CO2 adsorbed becomes 64 times when the pressure of CO2 is doubled. The value of n in the Freundlich isotherm equation is ____________ $$\times$$ 10$$-$$2. (Round off to the Nearest Integer)
3
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
100 ml of 0.0018% (w/v) solution of Cl$$-$$ ion was the minimum concentration of Cl$$-$$ required to precipitate a negative sol in one h. The coagulating value of Cl$$-$$ ion is _________ (Nearest integer)
4
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-1
For Freundlich adsorption isotherm, a plot of log (x/m) (y-axis) and log p (x-axis) gives a straight line. The intercept and slope for the line is 0.4771 and 2, respectively. The mass of gas, adsorbed per gram of adsorbent if the initial pressure is 0.04 atm, is ______ $$\times$$ 10–4 g.
(log 3 = 0.4771)
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