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MDCAT Chemistry Chapter 3 Atomic Structure Online Test MCQs With Answers
Question # 1
A gas with minimum charge to mass ratio, when cathode rays are passed through it
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Hydrogen
Oxygen
Nitrogen
Chlorine
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Question # 2
Transition from various energy levels to lowest energy level gives:
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P-fund series
Lyman series
Balmer series
Paschen series
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Question # 3
In general, for exothermic reactions to be spontaneous
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Temperature should be high
Temperature should be zero
Temperature should be low
Temperature has no effect
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Question # 4
The law of lavoisier and Laplace illustrates
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The principle of conservation of energy.
Equivalence of mechanical and thermal energy
The principle of conservation of matter
Equivalent of mechanical and chemical energy
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Question # 5
Free energy change for a reversible process is:
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>0
<0
Equal to zero
Unpredictable
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Question # 6
Enthalpy represents:
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reaction rate
heat content
activation energy
energy state
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Question # 7
The electrons are put in energy sub-levels in the order of increasing energy values. This is a statement of
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Hundus rule
Afbau principle
Pauli exclusion principle
Phase rule
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Question # 8
The velocity of photon is:
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Independent of its wavelength.
Depends on its wavelength.
Equal to square of its amplitude.
Depends on its source.
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Question # 9
The wave number of the light emitted by a certain source is 2 x 10
6
m. The wavelength of this light is
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500 nm
500 m
200 nm
5 x 10
7
m
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Question # 10
Cathode rays drive a small paddle wheel placed in their path. The observation indicates that
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Cathode rays are material particles having momentum
Cathode rays are negatively charged
Cathode rays produce X-rays
Cathode rays travel in straight line
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Question # 11
Point out the orbitals which are degenerate in a multi electron atom
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1s, 2s orbitals
2d orbitals
3s, 3p, 3d orbitals
3d orbitals
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Question # 12
Positive rays produce in discharge tube from
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Electricity
Gas molecule
Anode
Cathode
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Question # 13
n + l value for 4f will
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2
5
7
9
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Question # 14
In chromium (Cr - 24) the number of electrons with azimuthal quantum numbers, l = 1 and 2 are respectively
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12 and 4
12 and 5
4
5
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Question # 15
Which of the following series lines in the atomic emmision spectrum of hydrogen is in the visible region:
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Paschen
Bracket series
Balmer series
Lyman series
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Question # 16
Chlorine atom has set of
n, l, m
quantum number for the nupaired electrons
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2, 1, 1
3, 1, 1
2, 1, 0
3, 0, 0
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Question # 17
Arrangement of the fundament particles within an atom determines its
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physical properties
chemical properties
physical and chemical properties
no properties
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Question # 18
Quantum numbers are derived from
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Schrodinger wave equation
De-Broglie's equation
Bragg's equation
Planck's equation
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Question # 19
The value of R (Rydberg's constant) is _____________ m
-1
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1.0974 x 10
7
1.0842 x 10
7
1.082 x 10
-7
Both a and b
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Question # 20
According to the Aufbau principle the electrons and added first to the orbital:
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In sub-levels of zero energy
In sub-levels of highest energy
In sub-levels oflowest energy
of no shell
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