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
Rutherford | |
Aston | |
Neils Bohr | |
J.J. Thomson |
Question 2 |
How many 'd' electrons are present in Cr2+ ion?
4 | |
5 | |
6 | |
3 |
Question 3 |
How many
neutrons are present in tritium nucleus?
2 | |
3 | |
1 | |
0 |
Question 4 |
Energy of
H-atom in the ground state is –13.6 eV, hence energy in the second excited
state is
–6.8eV | |
–3.4eV | |
–1.51eV | |
–4.53eV |
Question 5 |
If the
electron of a hydrogen atom is present in the first orbit, the total energy of
the electron is
–e2 / r | |
–e2 / r2 | |
–e2 / 2r | |
–e2 / 2r2 |
Question 6 |
If the
wavelength of an electromagnetic radiation is 2000Å, what is its energy in
ergs?
9.94 × 10–12 | |
9.94 × 10–10 | |
4.97 × 10–12 | |
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:
+3.4 eV | |
+6.8 eV | |
-13.6 eV | |
+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
Third orbit | |
Second orbit | |
Fourth orbit | |
Fifth orbit |
Question 9 |
An electron
from one Bohr stationary orbit can go to next higher orbit
by emission of electromagnetic radiation | |
by absorption of any electromagnetic radiation | |
by absorption of electromagnetic radiation of particular frequency | |
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:
Heisenberg uncertainty principle | |
Hund’s rule | |
Pauli exclusion principle | |
Bohr postulate of stationary orbit |
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