# Structure of Atom | Atomic Structure: MCQs | Question – Paper 6 1

## Topic: Structure of Atom, Test No.: 06, Total MCQs: 10

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 Question 1
Nuclear theory of the atom was put forward by
 A Rutherford B Aston C Neils Bohr D J.J. Thomson
 Question 2
How many 'd' electrons are present in Cr2+ ion?
 A 4 B 5 C 6 D 3
 Question 3
How many neutrons are present in tritium nucleus?
 A 2 B 3 C 1 D 0
 Question 4
Energy of H-atom in the ground state is –13.6 eV, hence energy in the second excited state is
 A –6.8eV B –3.4eV C –1.51eV D –4.53eV
 Question 5
If the electron of a hydrogen atom is present in the first orbit, the total energy of the electron is
 A –e2 / r B –e2 / r2 C –e2 / 2r D –e2 / 2r2
 Question 6
If the wavelength of an electromagnetic radiation is 2000Å, what is its energy in ergs?
 A 9.94 × 10–12 B 9.94 × 10–10 C 4.97 × 10–12 D 4.97 × 10–19
 Question 7
In hydrogen atom, energy of first excited state is -3.4 eV. Then find out K.E. of same orbit of hydrogen atom:
 A +3.4 eV B +6.8 eV C -13.6 eV D +13.6 eV
 Question 8
The angular momentum of an electron present in the excited state of Hydrogen is 1.5h/p. The electron present in
 A Third orbit B Second orbit C Fourth orbit D Fifth orbit
 Question 9
An electron from one Bohr stationary orbit can go to next higher orbit
 A by emission of electromagnetic radiation B by absorption of any electromagnetic radiation C by absorption of electromagnetic radiation of particular frequency D without emission or absorption of electromagnetic radiation
 Question 10
If the nitrogen atom had electronic configuration 1s7, it would have energy lower than that of the normal ground state configuration 1s2 2s2 2p3, because the electrons would be closer to the nucleus, yet 1s7 is not observed because it violates:
 A Heisenberg uncertainty principle B Hund’s rule C Pauli exclusion principle D Bohr postulate of stationary orbit
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• garg rajat

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