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Friday, 9 October

JEE Main Chemistry · Surface Chemistry

Colloids in JEE Main

Colloids (Chemistry, Surface Chemistry) came 9 times in 9 of the 42 JEE Main shifts Lumi analysed, across 8 distinct ideas. 0 of them came in 2024–26; it was last asked in 2023.

Questions
9
in 9 shifts
Ideas asked
8
1 asked more than once
Numerical answer
1
11% of its questions
Pattern
Asked most years
rarely asked since 2024
Questions each year
0241’172’202’212’222’230’240’250’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 4Medium 5Hard 0

Format

  • Single correct5 Q
  • Assertion–reason1 Q
  • Numerical value1 Q
  • Other1 Q
  • Two statements1 Q
Ideas inside the topic
8 ideas
Where it sits

Part of Surface Chemistry, which had 16 questions in all. Colloids accounts for 56% of them. In Lumi's JEE taxonomy it belongs to Physical Chemistry.

Some questions sit in other chapters too: Solutions.

Every question

All 9 Colloids questions

Newest first, each with its options and official answer.

  1. 8 Apr 2023, Shift 2 · Q87Coagulating value of the electrolytes AlCl3\mathrm{AlCl_3} and NaCl for As2S3\mathrm{As_2S_3} are 0.09 and 50.04 respectively. The coagulating…EasyNumerical value
  2. 13 Apr 2023, Shift 2 · Q63Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of…MediumAssertion–reason
  3. 24 Jun 2022, Shift 1 · Q65Given below are two statements : Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on…MediumTwo statements
  4. 29 Jun 2022, Shift 1 · Q65Which of the following is a correct statement ?EasySingle correct
  5. 25 Jul 2021, Shift 1 · Q32Sodium stearate CH3(CH2)16COO−Na+\mathrm{CH_3(CH_2)_{16}COO^-Na^+} is an anionic surfactant which forms micelles in oil. Choose the correct statement for…MediumSingle correct
  6. 16 Mar 2021, Shift 2 · Q32The INCORRECT statements below regarding colloidal solutions is :EasySingle correct
  7. 8 Jan 2020, Shift 1 · Q28As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :MediumSingle correct
  8. 2 Sep 2020, Shift 1 · Q28Which of the following is used for the preparation of colloids ?EasySingle correct
  9. 2 Apr 2017 (offline) · Q34The Tyndall effect is observed only when following conditions are satisfied : (a) The diameter of the dispersed particles is much smaller…MediumOther