1
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In basic medium, H2O2 exhibits which of the following reactions?

(A) Mn2+ $$ \to $$ Mn4+

(B) I2 $$ \to $$ I$$-$$

(C) PbS $$ \to $$ PbSO4

Choose the most appropriate answer from the options given below :
A
(B) only
B
(A), (B) only
C
(A) only
D
(A), (C) only
2
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In the reaction of hypobromite with amide, the carbonyl carbon is lost as :
A
CO2
B
CO
C
HCO$$_3^ - $$
D
CO$$_3^{2 - }$$
3
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
4
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
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