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1
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The absolute value of the electron gain enthalpy of halogens satisfies :
A
Cl > Br > F > I
B
Cl > F > Br > I
C
I > Br > Cl > F
D
F > Cl > Br > I
2
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :
A
X and Y are metalloids and Z is a metal.
B
X and Z are non-metals and Y is a metalloid.
C
X is a metalloid, Y is a non-metal and Z is a metal.
D
X, Y and Z are metals.
3
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Identify the elements X and Y using the ionisation energy values given below :

Ionization energy (kJ/mol)
1$${st}$$ 2$${nd}$$
X 495 4563
Y 731 1450
A
X = F; Y = Mg
B
X = Mg; Y = F
C
X = Na; Y = Mg
D
X = Mg; Y = Na
4
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which pair of oxides is acidic in nature?
A
CaO, SiO2
B
B2O3, CaO
C
B2O3, SiO2
D
N2O, BaO
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