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Principles Related to Practical Chemistry

JEE Main 2024 (Online) 9th April Evening ShiftMatchingEasy📈 Topic in 12% papers+4−1
Ques. 1JEE Main 2024, 9 April (Evening Shift)

Match List I with List II Choose the correct answer from the options given below:

  1. A-II, B-III, C-IV, D-I
  2. A-III, B-IV, C-I, D-II
  3. A-I, B-II, C-III, D-IV
  4. A-IV, B-I, C-II, D-III

Answer

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

Solution

(A): an unsaturated compound (C=C / C≡C) adds Br2, so the reddish orange colour of bromine water disappears; hence (A) is II.

(B): an alcohol forms a red complex with ceric ammonium nitrate, so (B) is III.

(C): a phenol gives a blue, green, violet or red colour with neutral FeCl3, so (C) is IV.

(D): an aldehyde or ketone gives a yellow, orange or red 2,4-dinitrophenylhydrazone precipitate, so (D) is I.

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

Answer: (1)

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Ques. 2JEE Main 2024, 9 April (Evening Shift)

[figure] In the given TLC, the distance of spot A & B are 5 cm & 7 cm, from the bottom of TLC plate, respectively. Rf value of B is x 10-1 times more than A. The value of x is .

Ques. 3JEE Main 2024, 9 April (Evening Shift)

Consider the following test for a group-IV cation. M2+ + H2S A (Black precipitate) + byproduct A + aqua regia B + NOCl + S + H2O B + KNO2 + CH3COOH C + byproduct The spin-only magnetic moment value of the metal complex C is BM (Nearest integer)

Ques. 4JEE Main 2024, 8 April (Morning Shift)

Match List I with List II Choose the correct answer from the options given below:

  1. A-III, B-I, C-IV, D-II
  2. A-III, B-IV, C-I, D-II
  3. A-III, B-II, C-IV, D-I
  4. A-III, B-I, C-II, D-IV
Ques. 5JEE Main 2024, 8 April (Morning Shift)

Match List I with List II Choose the correct answer from the options given below:

  1. A-IV, B-I, C-II, D-III
  2. A-I, B-II, C-III, D-IV
  3. A-II, B-III, C-IV, D-I
  4. A-III, B-I, C-II, D-IV
Ques. 6JEE Main 2024, 8 April (Evening Shift)

Match List I with List II Choose the correct answer from the options given below :

  1. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
  2. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  3. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
  4. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
Ques. 7JEE Main 2024, 8 April (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 8JEE Main 2024, 8 April (Evening Shift)

In qualitative test for identification of presence of phosphorus, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :

  1. Na3PO4 12MoO3
  2. (NH4)3PO4 12(NH4)2MoO4
  3. MoPO4 21NH4NO3
  4. (NH4)3PO4 12MoO3
Ques. 9JEE Main 2024, 6 April (Morning Shift)

Match List I with List II Choose the correct answer from the options given below:

  1. A-III, B-IV, C-I, D-II
  2. A-III, B-IV, C-II, D-I
  3. A-IV, B-III, C-II, D-I
  4. A-IV, B-III, C-I, D-II
Ques. 10JEE Main 2024, 6 April (Morning Shift)

Which of the following statements are correct? Choose the most appropriate answer from the options given below :

  1. A, C, D only
  2. B, C, D only
  3. A, B, D only
  4. A, B, C only
Ques. 11JEE Main 2024, 6 April (Evening Shift)

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in NH4OH solution when sodium carbonate extract was first acidified with dil. HNO3 and then AgNO3 solution was added. This indicates presence of :

  1. I-
  2. CO32-
  3. Cl-
  4. Br-

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