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Principles Related to Practical Chemistry

JEE Main 2024 (Online) 9th April Morning ShiftMCQEasy📈 Topic in 42% papers+4−1
Ques. 1JEE Main 2024, 9 April (Morning Shift)

Methods used for purification of organic compounds are based on :

  1. neither on nature of compound nor on the impurity present.
  2. presence of impurity only.
  3. nature of compound and presence of impurity.
  4. nature of compound only.

Answer

(3) nature of compound and presence of impurity.

Solution

The choice of a purification method depends on the nature of the compound (solid or liquid, volatile or not, its solubility, boiling point) and on the impurity present in it. .g. a solid with an impurity of different solubility is purified by crystallisation, while liquids with different boiling points are separated by distillation.

Since both factors decide the method, (3) is correct.

Answer: (3)

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Ques. 2JEE 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
Ques. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE 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

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