1
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
For the Balmer series in the spectrum of H atom,
$$\overline \nu = {R_H}\left\{ {{1 \over {n_1^2}} - {1 \over {n_2^2}}} \right\}$$, the correct statements among (I) to (IV) are :
(I) As wavelength decreases, the lines in the series converge
(II) The integer n1 is equal to 2
(III) The lines of longest wavelength corresponds to n2 = 3
(IV) The ionization energy of hydrogen can be calculated from wave number of these lines
A
(II), (III), (IV)
B
(I), (II), (III)
C
(I), (III), (IV)
D
(I), (II), (IV)
2
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The number of orbitals associated with quantum number n = 5, ms = +$${1 \over 2}$$ is :
A
11
B
25
C
15
D
50
3
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
4
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
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