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Principles Related to Practical Chemistry

JEE Main 2025 (Online) 28th January Morning ShiftMCQEasy📈 Topic in 13% papers+4−1
Ques. 1JEE 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

Answer

(3) Both Statement I and Statement II are true

Solution

Statement I: In the titration of oxalic acid with KMnO4 (dil. H2SO4) the oxalic acid solution is warmed to about 60 before titration, because the reaction is very slow at room temperature. In the Mohr's salt (FAS) titration no heating is needed. True.

Statement II: 2MnO4- + 5C2O42- + 16H+ 2Mn2+ + 10CO2 + 8H2O

The first Mn2+ ions (MnSO4) form only at the higher temperature; once formed, Mn2+ catalyses the further reaction (autocatalysis).

In the FAS titration, heating would allow atmospheric oxygen to oxidise Fe2+ to Fe3+, so less KMnO4 would be used and an error would be introduced. True.

Answer: (3)

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Ques. 2JEE 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. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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+

Ques. 7JEE Main 2025, 24 January (Evening Shift)

Find the compound 'A' from the following reaction sequences. A aqua-regiaB [(2) AcOH](1) KNO2, NH4OH yellow ppt

  1. NiS
  2. MnS
  3. ZnS
  4. CoS
Ques. 8JEE Main 2025, 24 January (Evening Shift)

In Carius method of estimation of halogen, 0.25 g of an organic compound gave 0.15 g of silver bromide (AgBr). The percentage of Bromine in the organic compound is 10-1\% (Nearest integer). (Given : Molar mass of Ag is 108 and Br is 80 g mol-1)

Ques. 9JEE Main 2025, 23 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. Both Statement I and Statement II are false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
Ques. 10JEE Main 2025, 23 January (Morning Shift)

During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is %. (Given molar mass in g mol-1 of Ba : 137, S : 32, O : 16)

Ques. 11JEE Main 2025, 23 January (Evening Shift)

Identify A, B and C in the given below reaction sequence [figure]

  1. PbCl2, PbSO4, PbCrO4
  2. PbS, PbSO4, Pb(CH3COO)2
  3. PbS, PbSO4, PbCrO4
  4. PbCl2, Pb(SO4)2, PbCrO4

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