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JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :
A
neon, sodium and chlorine
B
argon, chlorine and sodium
C
chlorine, lithium and sodium
D
argon, lithium and sodium
2
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The common positive oxidation states for an element with atomic number 24, are :
A
+1 and +3
B
+2 to +6
C
+1 to +6
D
+1 and +3 to +6
3
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
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
4
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
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.
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