JEE Main 2024 (Online) 9th April Morning Shift | Practical Organic Chemistry Question 4 | Chemistry

1

JEE Main 2024 (Online) 9th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Identify the incorrect statements regarding primary standard of titrimetric analysis.

(A) It should be purely available in dry form.

(B) It should not undergo chemical change in air.

(C) It should be hygroscopic and should react with another chemical instantaneously and stoichiometrically.

(D) It should be readily soluble in water.

(E) $$\mathrm{KMnO}_4$$ & $$\mathrm{NaOH}$$ can be used as primary standard.

Choose the correct answer from the options given below :

A

(C) and (E) only

B

(A) and (B) only

C

(B) and (E) only

D

(C) and (D) only

2

JEE Main 2024 (Online) 8th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

Match List I with List II

	LIST I (Test)		LIST II (Identification)
A.	Bayer's test	I.	Phenol
B.	Ceric ammonium nitrate test	II.	Aldehyde
C.	Phthalein dye test	III.	Alcoholic-OH group
D.	Schiff's test	IV.	Unsaturation

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

3

JEE Main 2024 (Online) 8th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

Match List I with List II

	LIST I (Name of the test)		LIST II (Reaction sequence involved) [M is metal]
A.	Borax bead test	I.	$$\mathrm{MCO}_3 \rightarrow \mathrm{MO} \xrightarrow[+\Delta]{\mathrm{Co}\left(\mathrm{NO}_3\right)_2} \mathrm{CoO} \cdot \mathrm{MO}$$
B.	Charcoal cavity test	II.	$$\mathrm{MCO}_3 \rightarrow \mathrm{MCl}_2 \rightarrow \mathrm{M}^{2+}$$
C.	Cobalt nitrate test	III.	$$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7} \mathrm{M}\left(\mathrm{BO}_2\right)_2 \rightarrow \mathrm{MBO}_2 \rightarrow \mathrm{M}$$
D.	Flame test	IV.	$$\mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{CO}_3} \mathrm{MCO}_3 \rightarrow \mathrm{MO} \rightarrow \mathrm{M}$$

Choose the correct answer from the options given below:

A

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

B

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

C

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

D

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

4

JEE Main 2024 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in $$\mathrm{NH}_4 \mathrm{OH}$$ solution when sodium carbonate extract was first acidified with dil. $$\mathrm{HNO}_3$$ and then $$\mathrm{AgNO}_3$$ solution was added. This indicates presence of :

A

$$\mathrm{I}^{-}$$

B

$$\mathrm{CO}_3{ }^{2-}$$

C

$$\mathrm{Cl}^{-}$$

D

$$\mathrm{Br}^{-}$$