JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 9 January 2020, Shift 1, Chemistry Q34

Question 34 of 75 in this shift, Chemistry question 9 of 25, Section A.

The acidic, basic and amphoteric oxides, respectively, are :

(1) $\mathrm{MgO, Cl_2O, Al_2O_3}$
(2) $\mathrm{N_2O_3, Li_2O, Al_2O_3}$ Official answer
(3) $\mathrm{Cl_2O, CaO, P_4O_{10}}$
(4) $\mathrm{Na_2O, SO_3, Al_2O_3}$

Official answer

Option 2

NTA final key (Jan 2020).

Chapter: Classification of Elements and Periodicity in Properties
Topic: Periodic Trends
Idea tested: Acidic and Basic Character of Oxides

Same idea in other shifts

Asked 12× in all

2 Apr 2026, Shift 2 · Q58The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is:MediumSingle correct
5 Apr 2026, Shift 2 · Q58Given below are two statements : Statement I : The number of pairs among $\mathrm{[Al_2O_3, Cr_2O_3]}$ , $\mathrm{[Cl_2O_7, Mn_2O_7]}$ ,…MediumTwo statements
1 Feb 2024, Shift 1 · Q87Among the following oxides of p-block elements, number of oxides having amphoteric nature is ________. $\mathrm{Cl_2O_7}$ , CO,…MediumNumerical value
30 Jan 2024, Shift 2 · Q66Given below are two statements: Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1…EasyTwo statements
31 Jan 2024, Shift 1 · Q67Consider the oxides of group 14 elements $\mathrm{SiO_2}$ , $\mathrm{GeO_2}$ , $\mathrm{SnO_2}$ , $\mathrm{PbO_2}$ , CO and GeO. The…MediumSingle correct
25 Jul 2022, Shift 2 · Q70The total number of acidic oxides from the following list is $\mathrm{NO, N_2O, B_2O_3, N_2O_5, CO, SO_3, P_4O_{10}}$ MediumSingle correct
24 Jun 2022, Shift 1 · Q66Given below are the oxides : $\mathrm{Na_2O,\ As_2O_3,\ N_2O,\ NO}$ and $\mathrm{Cl_2O_7}$ Number of amphoteric oxides is :MediumSingle correct
28 Jun 2022, Shift 1 · Q67Given below are two statements : Statement I :The pentavalent oxide of group-15 element, $\mathrm{E_2O_5}$ , is less acidic than trivalent…MediumTwo statements

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.