1
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The electrons are more likely to be found : JEE Main 2019 (Online) 12th April Morning Slot Chemistry - Structure of Atom Question 107 English
A
only in the region a
B
in the region a arid c
C
only in the region c
D
in the region a and b
2
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
A
16, 6 and 3
B
15, 6 and 12
C
16, 5 and 2
D
15, 5 and 3
3
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are :
A
Paschen and Pfund
B
Balmer and Brackett
C
Lyman and Paschen
D
Brackett and Pfund
4
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The isoelectronic set of ions is :
A
F, Li+, Na+ and Mg2+
B
Li+, Na+, O2- and F-
C
N3–, O2-, F- and Na+
D
N3–, Li+, Mg2+ and O2-
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