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JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)  +4  -1
The set having ions which are coloured and paramagnetic both is -
A
Cu2+, Cr3+, Sc+
B
Cu2+, Zn2+, Mn4+
C
Sc3+, V5+, Ti4+
D
Ni2+, Mn7+, Hg2+
2
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
3
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
4
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
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