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Principles Related to Practical Chemistry · Question 27

JEE Main 2026 (Online) 23rd January Morning ShiftMCQEasy📈 Topic in 39% papers+4−1
1

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. Both Statement I and Statement II are true
  4. Statement I is false but Statement II is true

Answer

(1) Both Statement I and Statement II are false

Solution

Statement I: as per NCERT, sublimation separates sublimable compounds (those that change from solid to vapour directly without melting) from non-sublimable impurities. A low melting point is not the criterion false.

Statement II: a liquid boils when its vapour pressure equals the external pressure. If the external pressure is reduced, this happens at a lower temperature, so the boiling point decreases (used in distillation under reduced pressure) false.

Answer: (1)

JEE Main 2026 (Online) 23rd January Morning Shift

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2

In Carius method 0.2425 g of an organic compound gave 0.5253 g silver chloride. The percentage of chlorine in the organic compound is

  1. 87.65%
  2. 53.58%
  3. 37.57%
  4. 34.79%
JEE Main 2026 (Online) 23rd January Evening Shift
3

Sodium fusion extract of an organic compound (Y) with CHCl3 and chlorine water gives violet color to the CHCl3 layer. 0.15 g of (Y) gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound (Y) is . (Nearest integer) (Given : molar mass g mol-1 C : 12, H : 1, Cl : 35.5, Br : 80, I : 127)

JEE Main 2026 (Online) 22nd January Morning Shift
4

Identify the correct statements : Choose the correct answer from the options given below :

  1. D and E Only
  2. A, B and E Only
  3. A, B, C and E Only
  4. A, B and C Only
JEE Main 2026 (Online) 22nd January Evening Shift
5

When 1 g of compound (X) is subjected to Kjeldahl's method for estimation of nitrogen, 15 mL 1 M H2SO4 was neutralized by ammonia evolved. The percentage of nitrogen in compound (X) is :

  1. 0.21
  2. 21
  3. 42
  4. 0.42
JEE Main 2026 (Online) 22nd January Evening Shift
6

Consider the following reactions. (Hot solution)PbCl2 + K2CrO4 A + 2KCl A + NaOH B + Na2CrO4 PbSO4 + 4CH3COONH4 (NH4)2SO4 + X In the above reactions, A, B and X are respectively.

  1. Na2[Pb(OH)2], PbCrO4 and [Pb(NH3)4]SO4
  2. Na2[Pb(OH)2], PbCrO4 and (NH4)2[Pb(CH3COO)4]
  3. PbCrO4, Na2[Pb(OH)4] and (NH4)2[Pb(CH3COO)4]
  4. PbCrO4, Na2[Pb(OH)4] and [Pb(NH3)4]SO4
JEE Main 2026 (Online) 21st January Morning Shift
7

In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass 32 g mol-1). Molar mass of barium sulphate is 233 g mol-1.

  1. 4.55%
  2. 16.48%
  3. 10.30%
  4. 21.97%
JEE Main 2026 (Online) 21st January Morning Shift
8

On heating a mixture of common salt and K2Cr2O7 in equal amount along with concentrated H2SO4 in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:

  1. Cr2O2Cl2 and +3
  2. Cr2O2Cl2 and +6
  3. CrO2Cl2 and +6
  4. CrO2Cl2 and +5
JEE Main 2026 (Online) 21st January Evening Shift
9

By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X) is : (nearest integer) (Given, molar mass in g mol-1: O = 16, Mg = 24, P = 31)

  1. 40
  2. 30
  3. 20
  4. 50
JEE Main 2026 (Online) 21st January Evening Shift
10

On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g H2O and 0.307 g CO2. The percentages of hydrogen and oxygen in the given organic compound respectively are:

  1. 7.55, 43.85
  2. 6.72, 53.41
  3. 6.72, 39.87
  4. 53.41, 39.6
JEE Main 2025 (Online) 8th April Evening Shift
11

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

  1. A-II, B-III, C-I, D-IV
  2. A-II, B-IV, C-III, D-I
  3. A-III, B-II, C-IV, D-I
  4. A-II, B-III, C-IV, D-I
JEE Main 2025 (Online) 8th April Evening Shift

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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
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