JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 22 July 2021, Shift 2, Chemistry Q33

Question 33 of 90 in this shift, Chemistry question 3 of 30, Section A.

When silver nitrate solution is added to potassium iodide solution then the sol produced is :

(1) $\mathrm{AgI/I^-}$ Official answer
(2) $\mathrm{AgI/Ag^+}$
(3) $\mathrm{AgNO_3/NO_3^-}$
(4) $\mathrm{KI/NO_3^-}$

Official answer

Option 1

NTA final key.

Chapter: Surface Chemistry
Topic: Colloids
Idea tested: Predicting Sol Charge via Excess Reagent

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.