1
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
If the shortest wavelength in Lyman series of hydrogen atom is A, then the longestwavelength in Paschen series of He+ is :
A
$${{5A} \over 9}$$
B
$${{9A} \over 5}$$
C
$${{36A} \over 5}$$
D
$${{36A} \over 7}$$
2
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The radius of the second Bohr orbit for hydrogen atom is:
(Planck’s Const. h = 6.6262 × 10-34 Js; mass of electron = 9.1091 × 10-31 kg; charge of electron (e) = 1.60210 × 10-19 C; permittivity of vacuum ($${\varepsilon _0}$$) = 8.854185 × 10-12 kg-1 m-3 A2)
A
4.76 $$\mathop {\rm A}\limits^o $$
B
2.12 $$\mathop {\rm A}\limits^o $$
C
0.529 $$\mathop {\rm A}\limits^o $$
D
1.65 $$\mathop {\rm A}\limits^o $$
3
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The group having isoelectronic species is:
A
O2- , F- , Na+, Mg2+
B
O2- , F- , Na, Mg2+
C
O- , F- , Na+, Mg2+
D
O- , F- , Na, Mg+
4
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The total number of orbitals associated with the principal quantum number 5 is :
A
5
B
10
C
20
D
25
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