1
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
2
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
3
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are two statements :

Statement I : Bohr's theory accounts for the stability and line spectrum of Li+ ion.

Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is false but statement II is true.
B
Both statement I and statement II are true.
C
Statement I is true but statement II is false.
D
Both statement I and statement II are false.
4
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The oxidation states of nitrogen in NO, NO2, N2O and NO$$_3^ - $$ are in the order of :
A
N2O > NO2 > NO > NO$$_3^ - $$
B
NO > NO2 > N2O > NO$$_3^ - $$
C
NO2 > NO$$_3^ - $$ > NO > N2O
D
NO$$_3^ - $$ > NO2 > NO > N2O
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