1
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
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Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)
A
Nd
B
Yb
C
La
D
Ce
2
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
The addition of dilute NaOH to Cr3+ salt solution will give :
A
a solution of [Cr(OH)4]$$-$$
B
precipitate of Cr2O3(H2O)n
C
precipitate of [Cr(OH)6]3$$-$$
D
precipitate of Cr(OH)3
3
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Potassium permanganate on heating at 513 K gives a product which is :
A
paramagnetic and colourless
B
diamagnetic and green
C
diamagnetic and colourless
D
paramagnetic and green
4
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
The nature of oxides V2O3 and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :
A
X = basic Y = amphoteric
B
X = amphoteric Y = basic
C
X = acidic Y = acidic
D
X = basic Y = basic
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