1
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+
2
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
3
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h / $$\lambda $$ (where $$\lambda $$ is wavelength associated with electron wave) is given by :
A
2meV
B
$$\sqrt {meV} $$
C
$$\sqrt {2meV} $$
D
meV
4
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following is the energy of a possible excited state of hydrogen?
A
–6.8 eV
B
–3.4 eV
C
+6.8 eV
D
+13.6 eV
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