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1
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are :

(At.No. Sc : 21, Ti : 22, V : 23)
A
3.87, 1.73, 0
B
1.73, 3.87, 0
C
1.73, 0, 3.87
D
0, 3.87, 1.73
2
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which one of the following metals forms interstitial hydride easily?
A
Cr
B
Fe
C
Mn
D
Co
3
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct order of following 3d metal oxides, according to their oxidation numbers is :

(a) CrO3, (b) Fe2O3, (c) MnO2, (d) V2O5, (e) Cu2O
A
(d) > (a) > (b) > (c) > (e)
B
(a) > (c) > (d) > (b) > (e)
C
(a) > (d) > (c) > (b) > (e)
D
(c) > (a) > (d) > (e) > (b)
4
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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+
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