JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 24 February 2021, Shift 2, Chemistry Q33

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

Most suitable salt which can be used for efficient clotting of blood will be :

(1) $\mathrm{NaHCO_3}$
(2) $\mathrm{Mg(HCO_3)_2}$
(3) $\mathrm{FeCl_3}$ Official answer
(4) $\mathrm{FeSO_4}$

Official answer

Option 3

NTA final key.

Chapter: Surface Chemistry
Topic: Colloids
Idea tested: Hardy-Schulze Rule

Same idea in other shifts

Asked 5× in all

10 Apr 2023, Shift 2 · Q63Ferric chloride is applied to stop bleeding because -EasySingle correct
15 Apr 2023, Shift 1 · Q8620 mL of 0.5 M NaCl is required to coagulate 200 mL of $\mathrm{As_2S_3}$ solution in 2 hours. The coagulating value of NaCl is __________.EasyNumerical value
17 Mar 2021, Shift 2 · Q33For the coagulation of a negative sol, the species below, that has the highest flocculating power is :EasySingle correct
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

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.