1
JEE Main 2020 (Online) 2nd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Three elements X, Y and Z are in the 3rd period
of the periodic table. The oxides of X, Y and Z,
respectively, are basic, amphoteric and acidic.
The correct order of the atomic numbers of X,
Y and Z is :
2
JEE Main 2020 (Online) 2nd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
In general the property (magnitudes only) that
show an opposite trend in comparison to other
properties across a period is
3
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The first and second ionisation enthalpies of a
metal are 496 and 4560 kJ mol–1, respectively.
How many moles of HCl and H2SO4,
respectively, will be needed to react completely
with 1 mole of the metal hydroxide ?
4
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The acidic, basic and amphoteric oxides,
respectively, are :
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