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Published on: 24/08/2019
Structure of Atom
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Questions + Answers key
Take MCQ Chemistry Test
1.
Show the distribution of electrons in oxygen atom (atomic number 8) using an orbital diagram.
2.
What is the difference between ground state and excited state?
3.
Which one Fe3+, Fe2+ is more paramagnetic and why?
4.
Which series of lines of the hydrogen spectrum lie in the visible region?
5.
Which of the following orbitals are degenerate?
6.
Why are Bohr's orbits called stationary states?
7.
What is the difference in the origin of cathode rays and anode rays?
8.
If the value of azimuthal quantum number is 2, what will be the values for magnetic quantum number?
2
3
4
5
9.
The maximum number of electrons in a sub-shell is given by the equation _______.
n2
2n2
21-1
21 + 1
10.
The energy needed to remove a single electron (most loosely bound) from an isolated gaseous atom is called _______.
ionisation energy
electronegativity
kinetic energy
electron affinity
11.
The Balmer series in the spectrum of hydrogen atom falls in _______.
ultraviolet region
visible region
infrared region
none of these
12.
Cathode rays are deflected by _______.
electric field only
electric and magnetic field
magnetic field only
none of these
1.
8O = 1 s2 2s2 2p4
2.
Ground state means the lowest energy state. When the electrons absorb energy and jump to outer orbits, this state is called excited state.
3.
As Fe3+ contains 5 unpaired electrons while Fe2+ contains only 4 unpaired electrons. Fe3+ is more paramagnetic.
4.
The Balmer series lies in the visible region.
5.
The orbitals which belong to same subshell and same shell are called degenerate orbitals.(3dxy,3dz2,3dyz) and (4 dxy,4 dzy,4 dz2) are the two sets of degenerate orbitals
6.
This is because the energies of the orbits in which the electrons revolve are fixed.
7.
Cathode rays originate from the cathode whereas anode rays are not obtained from the anode. They are produced from the gaseous atoms by knock out of the electrone with high speed cathode rays.
8.
(d)
5
9.
(d)
21 + 1
10.
(a)
ionisation energy
11.
(b)
visible region
12.
(b)
electric and magnetic field
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