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Principles Related to Practical Chemistry · Question 50

JEE Main 2025 (Online) 2nd April Evening ShiftMCQEasy📈 Topic in 16% papers+4−1
1

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)

JEE Main 2025 (Online) 2nd April Evening Shift

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2

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)
JEE Main 2025 (Online) 2nd April Evening Shift
3

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
JEE Main 2025 (Online) 29th January Morning Shift
4

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
JEE Main 2025 (Online) 28th January Morning Shift
5

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+
JEE Main 2025 (Online) 28th January Morning Shift
6

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
JEE Main 2025 (Online) 28th January Evening Shift
7

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
JEE Main 2025 (Online) 28th January Evening Shift

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