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1
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
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Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25; Oleate : 0.04 - 1.0; Starch : 15 - 25. Which among these is a better protective colloid ?
A
Gelatin
B
Gum Arabic
C
Oleate
D
Starch
2
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :
A
Enthalpy of adsorption is greater than 100 kJ mol−1.
B
Energy of activation is low.
C
Adsorption is monolayer.
D
Adsorption increases with increase in temperature.
3
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
For a linear plot of log (x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct ? (k and n are constants)
A
Both k and 1/n appear in the slope term.
B
1/n appears as the intercept.
C
Only 1/n appears as the slope
D
log (1/n) appears as the intercept.
4
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is:
A
36 mg
B
42 mg
C
54 mg
D
18 mg
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