JEE Main 2017 (Offline) | Structure of Atom Question 140 | Chemistry

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)

4.76 $$\mathop {\rm A}\limits^o $$

2.12 $$\mathop {\rm A}\limits^o $$

0.529 $$\mathop {\rm A}\limits^o $$

1.65 $$\mathop {\rm A}\limits^o $$

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

The group having isoelectronic species is:

O^2- , F^- , Na⁺, Mg²⁺

O^2- , F^- , Na, Mg²⁺

O^- , F^- , Na⁺, Mg²⁺

O^- , F^- , Na, Mg⁺

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

The total number of orbitals associated with the principal quantum number 5 is :

JEE Main 2016 (Offline)

MCQ (Single Correct Answer)

-1

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 :

2meV

$$\sqrt {meV} $$

$$\sqrt {2meV} $$

meV

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