NEET UG 2019 · Chemistry · Question 72
NEET 2019 Chemistry, question 72
Question 72 of the NEET 2019 paper (code P1) is a Chemistry question from Surface Chemistry. Its idea, Charge on Sols, was asked only this once in NEET 2017–2026. The NTA final answer key gives options 1 and 2 (the key accepted both).
Updated 2026-10-08
Q72 · Chemistry
Which mixture of the solutions will lead to the formation of negatively charged colloidal sol. ?
- 150 mL of 1 M + 50 mL of 1.5 M KIOfficial answer
- 250 mL of 1 M + 50 mL of 2 M KIOfficial answer
- 350 mL of 2 M + 50 mL of 1.5 M KI
- 450 mL of 0.1 M + 50 mL of 0.1 M KI
Official answer: options 1 and 2 · NTA final answer keyThe key accepted more than one option for this question.
Same idea
The only question on Charge on Sols
No other NEET paper from 2017–2026 tested this exact idea.
The chapter
Surface Chemistry in ten years of NEET
8 questions from 2017–2026, asked in 7 of 10 papers, about 0.8 a paper. Surface Chemistry and Colloids alone had 8.