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1
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively :

5Fe2+ + MnO$$_4^ - $$ + 8H+ $$\to$$ Mn2+ + 4H2O + 5Fe3+
A
Yellow, Orange
B
Yellow, Green
C
Green, Orange
D
Green, Yellow
2
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :
A
Ru
B
Mn
C
Co
D
Fe
3
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
A
4f76s2
B
4f6
C
4f7
D
4f66s2
4
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In which one of the following sets all species show disproportionation reaction?
A
ClO$$_2^ - $$, F2, MnO$$_4^ - $$ and Cr2O$$_7^{2 - }$$
B
Cr2O$$_7^{2 - }$$, MnO$$_4^{ - }$$, ClO$$_2^{- }$$ and Cl2
C
MnO$$_4^{ - }$$, ClO$$_2^{- }$$, Cl2 and Mn3+
D
ClO$$_4^{ - }$$, MnO$$_4^{ - }$$, ClO$$_2^{ - }$$ and F2
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