1
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II:

List I (Mixture) List II (Separation Technique)
A. $\mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$ I. Steam distillation
B. $\mathrm{C}_6 \mathrm{H}_{14}+\mathrm{C}_5 \mathrm{H}_{12}$ II. Differential extraction
C. $\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2+\mathrm{H}_2 \mathrm{O}$ III. Distillation
D. $\text { Organic compound in } \mathrm{H}_2 \mathrm{O}$ IV. Fractional distillation
A
A-III, B-I, C-IV, D-II
B
A-II, B-I, C-III, D-IV
C
A-IV, B-I, C-III, D-II
D
A-III, B-IV, C-I, D-II
2
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

Compound that will give positive Lassaigne's test for both nitrogen and halogen is :

A
$$\mathrm{NH_2OH.HCl}$$
B
$$\mathrm{N_2H_4.HCl}$$
C
$$\mathrm{CH_3NH_2.HCl}$$
D
$$\mathrm{NH_4Cl}$$
3
JEE Main 2022 (Online) 26th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$.

Assertion A: Phenolphthalein is a $$\mathrm{pH}$$ dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium.

Reason R: Phenolphthalein is a weak acid. It doesn't dissociate in basic medium.

In the light of the above statements, choose the most appropriate answer from the options given below.

A
Both $$\mathbf{A}$$ and $$\mathbf{R}$$ are true and $$\mathbf{R}$$ is the correct explanation of $$\mathbf{A}$$.
B
Both $$\mathbf{A}$$ and $$\mathbf{R}$$ are true but $$\mathbf{R}$$ is NOT the correct explanation of $$\mathbf{A}$$.
C
A is true but R is false.
D
A is false but R is true.
4
JEE Main 2022 (Online) 26th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which technique among the following, is most appropriate in separation of a mixture of $$100 \,\mathrm{mg}$$ of $$p$$-nitrophenol and picric acid ?

A
Steam distillation
B
2-5 ft long column of silica gel
C
Sublimation
D
Preparative TLC (Thin Layer Chromatography)
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