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Principles Related to Practical Chemistry

JEE Main 2025 (Online) 22nd January Morning ShiftNumericalEasy📈 Topic in 47% papers+4
Ques. 1JEE Main 2025, 22 January (Morning Shift)

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is %. (Given : molar mass in g mol-1 of Ag:108, Cl:35.5)

Answer

20

Solution

All Cl is converted to AgCl: \% Cl = 35.5143.5 143.5180 100

= 35.5180 100 = 19.7 20

Answer: 20

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Ques. 2JEE Main 2025, 22 January (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 false
  2. Statement I is true but Statement II is false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are true
Ques. 3JEE Main 2024, 9 April (Morning Shift)

Identify the incorrect statements regarding primary standard of titrimetric analysis. Choose the correct answer from the options given below :

  1. (C) and (E) only
  2. (A) and (B) only
  3. (B) and (E) only
  4. (C) and (D) only
Ques. 4JEE 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.
Ques. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE 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

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