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1
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following metals forms interstitial hydride easily?
A
Cr
B
Fe
C
Mn
D
Co
2
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
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)
3
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Cu2+ salt reacts with potassium iodide to give
A
Cu2I2
B
Cu2I3
C
Cul
D
Cu(I3)2
4
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO4 . 5H2O, respectively, are :
A
5 and 1
B
4 and 1
C
6 and 5
D
6 and 4
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