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Online Tests
MDCAT Chemistry Chapter 3 Atomic Structure Online Test MCQs With Answers
Question # 1
The series of lines produced when electron falls from higher energy levels n
2
= 2,3,4,5, .......... to n
1
= 1 is called
Choose an answer
Balmer series
Paschen series
Pfund series
Lyman series
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Question # 2
n + l value for 4f will
Choose an answer
2
5
7
9
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Question # 3
The unit ergs joule and calorie are inter-convertible which of following is incorrect
Choose an answer
107 rgs = 1j
4.184j = 1 cal
1 j = 0.2390 cal
1 erg = 4.184 cal
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Question # 4
Thermodynamics is concerned with
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Total energy of a system
Rate of a chemical change
Energy changes in a system
Mass changes in nuclear reactions
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Question # 5
Amount of heat evolved when one mole of a substance is completely burnt in excess of oxygen under standard conditions is called
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Enthalpy of neutralization
Enthalpy of combustion
Enthalpy of solution
Enthalpy of atimization
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Question # 6
The radius of the second orbit is
Choose an answer
2.11 x 10
-11
m
1.006 A°
2.1A°
2.11 x 10
-12
m
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Question # 7
In which of the following change entropy decreases
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Crystallization of sucrose in water
Melting of ice
Dissolving sucrose in water
Vaporization of camphor
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Question # 8
Charge to mass ratio (e/m) of the electron is determined by
Choose an answer
R.A Millikan
J.J Thompson
G.J Stoney
None of these
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Question # 9
A cylinder of gas supplied by PSO is assumed to contain 14 kg of butane.If a normal family requires 20,000 kJ of energy per day for cooking butane gas in the cylinder last for .....days (Δ H
c
of C
4
H
10
= -2658 kJ per mole)
Choose an answer
15 days
20 days
50 days
32 days
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Question # 10
The amount of heat evolved or absorbed in a chemical reaction when represented in a chemical equation is called:
Choose an answer
entropy of a reaction
free energy of reaction
heat of reaction
none of above
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Question # 11
The value of R (Rydberg's constant) is _____________ m
-1
Choose an answer
1.0974 x 10
7
1.0842 x 10
7
1.082 x 10
-7
Both a and b
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Question # 12
The possible number of orbitals in level with n = 3 is
Choose an answer
1
3
4
9
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Question # 13
The nature of positive rays depend on:
Choose an answer
Nature of discharge tube.
Nature of resident gas.
Nature of electrode.
All of above.
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Question # 14
Orbitals having same enrgy are called
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Hybrid orbitals
Valence orbitals
Degenerate orbitals
D-orbitals
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Question # 15
Thermochemistry is the study of chemical reaction accompanying
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Mass change
rate change
heat change
vol change
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Question # 16
If Aufbau rule is not followed in filling of the sub-shells then the block of which will change in the periodic table
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K (19)
Sc (21)
V (23)
Ni (28)
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Question # 17
Splitting of spectral lines of the hydrogen atom under the influence of magnetic field is called
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stark effect
zeeman effect
Compton effect
photoelectric effect
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Question # 18
If uncertainty in position of electron is zero, the uncertainty in its momentum would be:
Choose an answer
Also zero
50%
Less than zero
Infinite
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Question # 19
The range of visible spectrum is
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300 - 600 nm
600 - 900 nm
400 - 750 nm
100 - 300 nm
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Question # 20
Which of the following values of heat of formation indicates that the product is most stabel
Choose an answer
-97 kj
-231.6 kj
+21.4 kj
+70 kj
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Question # 21
Charge on electron was discovered by:
Choose an answer
Millikan
Crook
Neil Bohr
Rutherford
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