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Saturday, 31 October

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JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 3 August 2021, Shift 1, Chemistry Q36

Question 36 of 90 in this shift, Chemistry question 6 of 30, Section A.

The percentage of oxides in Portland Cement decreases in the order

(1) $\mathrm{CaO > SiO_2 > Al_2O_3 > MgO}$ Official answer
(2) $\mathrm{CaO > Al_2O_3 > MgO > SiO_2}$
(3) $\mathrm{SiO_2 > CaO > MgO > Al_2O_3}$
(4) $\mathrm{SiO_2 > CaO > Al_2O_3 > MgO}$

Official answer

Option 1

NTA final key.

Chapter: The p-Block Elements
Topic: No close match in our taxonomy
Idea tested: No close match in our taxonomy

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.