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Principles Related to Practical Chemistry

JEE Main 2025 (Online) 2nd April Evening ShiftMCQEasy📈 Topic in 13% papers+4−1
Ques. 1JEE Main 2025, 2 April (Evening Shift)

Formation of Na4[Fe(CN)5NOS], a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:

  1. Sulphide ion
  2. Sulphite ion
  3. Sulphate ion
  4. Sodium ion

Answer

(1) Sulphide ion

Solution

Sodium nitroprusside, Na2[Fe(CN)5NO], reacts with sulphide ion in alkaline (sodium carbonate) extract:

Na2S + Na2[Fe(CN)5NO] Na4[Fe(CN)5NOS]

The product, sodium thionitroprusside, is purple (violet). Sulphite and sulphate ions do not give this colour, and Na+ is present in the reagent and the extract anyway.

The purple colour confirms the sulphide ion, S2-.

Answer: (1)

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Ques. 2JEE Main 2025, 2 April (Evening 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)-(II), (D)-(I)
  3. (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
  4. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
Ques. 3JEE Main 2025, 29 January (Morning Shift)

The steam volatile compounds among the following are : Choose the correct answer from the options given below :

  1. (B) and (D) Only
  2. (A), (B) and (C) Only
  3. (A) and (B) Only
  4. (A) and (C) Only
Ques. 4JEE Main 2025, 29 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. Statement I is true but Statement II is false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are false
  4. Both Statement I and Statement II are true
Ques. 5JEE Main 2025, 29 January (Evening Shift)

In the sulphur estimation, 0.20 g of a pure organic compound gave 0.40 g of barium sulphate. The percentage of sulphur in the compound is 10-1\%. (Molar mass : O = 16, S = 32, Ba = 137 in g mol-1)

Ques. 6JEE Main 2025, 28 January (Morning Shift)

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

  1. Statement I is false but Statement II is true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are true
  4. Both Statement I and Statement II are false
Ques. 7JEE Main 2025, 28 January (Morning Shift)

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is

  1. Cr3+
  2. Ti3+
  3. Ni2+
  4. Mn2+
Ques. 8JEE Main 2025, 28 January (Evening Shift)

The purification method based on the following physical transformation is : (X)Solid Heat (X)Vapour Cool (X)Solid

  1. Extraction
  2. Crystallization
  3. Distillation
  4. Sublimation
Ques. 9JEE Main 2025, 28 January (Evening Shift)

Identify the inorganic sulphides that are yellow in colour : Choose the correct answer from the options given below :

  1. (D) and (E) only
  2. (A) and (B) only
  3. (A), (D) and (E) only
  4. (A) and (C) only
Ques. 10JEE Main 2025, 24 January (Morning Shift)

Given below are two statements I and II. In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is true but Statement II is false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Both Statement I and Statement II are false
Ques. 11JEE Main 2025, 24 January (Morning Shift)

Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with K4[Fe(CN)6] is . Cu2+, Fe3+, Ba2+, Ca2+, NH4+, Mg2+, Zn2+

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All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structurep-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry