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Principles Related to Practical Chemistry

JEE Main 2024 (Online) 31st January Morning ShiftMatchingEasy📈 Topic in 42% papers+4−1
Ques. 1JEE Main 2024, 31 January (Morning Shift)

Match List I with List II

  1. A-I, B-II, C-IV, D-III
  2. A-II, B-III, C-I, D-IV
  3. A-IV, B-I, C-II, D-III
  4. A-IV, B-III, C-II, D-I

Answer

(4) A-IV, B-III, C-II, D-I

Solution

A: simple distillation – liquids with a large difference in b.p. (chloroform 334 K, aniline 457 K) ⇒ A–IV

B: fractional distillation – liquids with close b.p., e.g. crude oil fractions ⇒ B–III

C: steam distillation – steam-volatile liquid immiscible with water, e.g. aniline–water ⇒ C–II

D: reduced pressure – liquid that decomposes at its b.p., e.g. glycerol from spent-lye ⇒ D–I

∴ A-IV, B-III, C-II, D-I

Answer: (4)

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Ques. 2JEE Main 2024, 31 January (Morning Shift)

'Adsorption' principle is used for which of the following purification method?

  1. Chromatography
  2. Sublimation
  3. Distillation
  4. Extraction
Ques. 3JEE Main 2024, 31 January (Morning Shift)

Molar mass of the salt from NaBr, NaNO3, KI and CaF2 which does not evolve coloured vapours on heating with concentrated H2SO4 is g mol-1. (Molar mass in g mol-1 : Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)

Ques. 4JEE Main 2024, 31 January (Evening Shift)

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is -

  1. distillation
  2. steam distillation
  3. distillation under reduced pressure
  4. crystallisation
Ques. 5JEE Main 2024, 30 January (Morning Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate 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. Both Statement I and Statement II are true
  4. Statement I is false but Statement II is true
Ques. 6JEE Main 2024, 30 January (Morning Shift)

The Lassaigne's extract is boiled with dil HNO3 before testing for halogens because,

  1. Silver halides are soluble in HNO3.
  2. AgCN is soluble in HNO3.
  3. Na2S and NaCN are decomposed by HNO3.
  4. Ag2S is soluble in HNO3.
Ques. 7JEE Main 2024, 30 January (Morning Shift)

On a thin layer chromatographic plate, an organic compound moved by 3.5 cm, while the solvent moved by 5 cm. The retardation factor of the organic compound is 10-1.

Ques. 8JEE Main 2024, 30 January (Evening Shift)

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

  1. Distillation
  2. Sublimation
  3. Column Chromatography
  4. Differential Extraction
Ques. 9JEE Main 2024, 30 January (Evening Shift)

Number of metal ions characterized by flame test among the following is . Sr2+, Ba2+, Ca2+, Cu2+, Zn2+, Co2+, Fe2+

Ques. 10JEE Main 2024, 29 January (Morning Shift)

In chromyl chloride test for confirmation of Cl- ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10\% H2O2 turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

  1. +6
  2. +5
  3. +3
  4. +10
Ques. 11JEE Main 2024, 29 January (Morning Shift)

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with FeSO4 in presence of concentrated H2SO4 indicates the presence of element/s

  1. Br
  2. S
  3. N and S
  4. N

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