JEE Main 2024 (Online) 6th April Evening Shift | Practical Organic Chemistry Question 8 | Chemistry

1

JEE Main 2024 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

The correct statement among the following, for a "chromatography" purification method is :

A

$$\mathrm{R}_f$$ of a polar compound is smaller than that of a non-polar compound.

B

Non-polar compounds are retained at top and polar compounds come down in column chromatography.

C

Organic compounds run faster than solvent in the thin layer chromatographic plate.

D

$$\mathrm{R}_f$$ is an integral value.

2

JEE Main 2024 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Match List I with List II

	LIST I (Precipitating reagent and conditions)		LIST II (Cation)
A.	$$ \mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH} $$	I.	$$\mathrm{Mn^{2+}}$$
B.	$$ \mathrm{NH}_4 \mathrm{OH}+\mathrm{Na}_2 \mathrm{CO}_3 $$	II.	$$\mathrm{Pb^{2+}}$$
C.	$$ \mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}+\mathrm{H}_2 \mathrm{~S} \text { gas } $$	III.	$$\mathrm{Al^{3+}}$$
D.	dilute $$\mathrm{HCl}$$	IV.	$$\mathrm{Sr^{2+}}$$

Choose the correct answer from the options given below:

A

A-III, B-IV, C-I, D-II

B

A-III, B-IV, C-II, D-I

C

A-IV, B-III, C-II, D-I

D

A-IV, B-III, C-I, D-II

3

JEE Main 2024 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which of the following statements are correct?

A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.

B. Aniline can be purified by steam distillation as aniline is miscible in water.

C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.

D. An organic compound is pure, if mixed M.P. is remained same.

Choose the most appropriate answer from the options given below :

A

A, C, D only

B

B, C, D only

C

A, B, D only

D

A, B, C only

4

JEE Main 2024 (Online) 4th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :

A

decrease concentration of $${ }^{-} \mathrm{OH}$$ ions

B

increase concentration of $$\mathrm{Cl}^{-}$$ ions

C

prevent interference by phosphate ions

D

increase concentration of $$\mathrm{NH}_4{ }^{+}$$ ions