1
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

A
Chromatographic separation
B
Fractional Crystallisation
C
Steam distillation
D
Sublimation
2
JEE Main 2022 (Online) 24th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

During the qualitative analysis of salt with cation y2+, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y2+) present respectively are :

A
Dimethylglyoxime and Ni2+
B
Dimethylglyoxime and Co2+
C
Nessler's reagent and Hg2+
D
Nessler's reagent and Ni2+
3
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Sodium stearate CH3(CH2)16COO$$-$$Na+ is an anionic surfactant which forms micelles in oil.

Choose the correct statement for it from the following :
A
It forms spherical micelles with CH3(CH2)16 - group pointing towards the centre of sphere.
B
It forms non-spherical micelles with -COO$$-$$ group pointing outwards on the surface.
C
It forms spherical micelles with CH3(CH2)16 - group pointing outwards on the surface of sphere
D
It forms non-spherical micelles with CH3(CH2)16 - group pointing towards the centre.
4
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?
A
Simple distillation
B
Steam ditillation
C
Fractional distillation
D
Reduced pressure distillation
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