1
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63oC while the other boils at 60oC What is the best way to separate the two liquids and which one will be distilled out first ?
A
fractional distillation, 3-methylpentane
B
simple distillation, 3-methylpentane
C
fractional distillation, isohexane
D
simple distillation, isohexane
2
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethylacelate (20:80), the sequence of obtained compounds is :
A
(A), (B) and (C)
B
(B), (A) and (C)
C
(C), (A) and (B)
D
(B), (C) and (A)
3
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
A solution of m-chloronailimne, m-chlorophenol and m-chlorobenzoic acid in ethyal acetate was extracted initially with a saturated solution of NaHCO3 to give fraction A. The left over organic phase was extracted with dilute NaoH solution tio give fraction B. The final organiic layer was labelled as fraction C. Fractions A,B and C, contain respectively :
A
m-chlorobenzoic acid, m-chloroaniline and m-chlorophenol.
B
m-chlorobenzoic acid, m-chlorophenol and m-chloroaniline.
C
m-chlorophenol, m-chlorobenzoic acid and m-chloronailine.
D
m-chloroaniline m-chlorobenzoic acid and m-chlorophenol.
4
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The principle of column chromatography is
A
Gravitational force.
B
Capillary action.
C
Differential adsorption of the substances on the solid phase.
D
Differential absorption of the substances on the solid phase.
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