26th Dec Atomic Structure Quiz 1 – Punjab Meritorious School Preparation Portal

Welcome to your 26th Dec Atomic Structure Quiz 1 CBT TEST

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The energy of an electron in the ground state of He⁺ is:

Equal to the energy of an electron in the ground state of H atom

Twice the energy of an electron in the ground state of H atom

Four times the energy of an electron in the ground state of H atom

There is no definite relation between the two energies.

If a moving particle has wavelength (λ), the new wavelength when its kinetic energy is doubled is:

2λ

√2λ

λ /2

λ/√2

Electron in 1^st shell of H-atom gains energy twice the amount of its ionization energy. KE of the escaped electron is:

10.2 eV

3.4 eV

13.6 eV

0.52 eV

242 nm is just sufficient to ionise sodium atom. lonisation energy of sodium atom will be:

The potential energy of an electron in the 2^nd orbit of Li⁺² is:

-13.6eV

-108.8eV

-61.12 eV

- 27.2eV

The kinetic and potential energy (in eV) of electron present in third Bohr's orbit of hydrogen atom are respectively:

- 1.51, - 3.02

1.51, -3.02

-3.02, 1.51

1.51, -1.51

If radius of the 2^nd orbits in He is 'r' then the radius of the 6^th orbit is:

None

The energy of an electron in the first Bohr orbit of H-atom is -13.6 eV. The possible energy value (s) of the excited state (s) for electrons in Bohr orbits of hydrogen is (are)

- 3.4 eV

- 4.2 eV

- 6.8 eV

+ 6.8 eV

If the radius of the first Bohr's orbit is as, then the radius of the third orbit would be.

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