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Online Tests
PPSC Chemistry Part I Physical Chemistry Online Test MCQs With Answers
Question # 1
Which of the following is a natural polymer
Choose an answer
Nylon
Leucite
Cellulose
Polystyrene
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Question # 2
The reverse of photo chemical reaction is called.
Choose an answer
Phosphorescence
Chemiluminescence
Fluorescence
Photscnaitization
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Question # 3
A colloidal system in which a liquid is dispersed in a solid is called a/an
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Emulsion
Sol
Gel
Precipitate
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Question # 4
The lowest K.E. for an electron is three dime national cubic box is given by
Choose an answer
h
2
/ 8m
a
3h
2
/ 8 ma
2
9h
2
/ 8ma
2
16h
2
/ 8ma
2
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Question # 5
The equivalent conductance of a 1 N solution of an electrolyte is nearly
Choose an answer
The same as its specific conductance
10
3
times more than its specific conductance
10-3 times its specific conductance
100 times its specific conductance.
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Question # 6
The temperature of which the compound melts into a liquid to the same composition as the solid is called the
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Congruent melting point
Incongruent melting point
Peritectic temperatures
Metastable point
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Question # 7
Brass is an alloy of
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Copper and tin
Copper and zinc
Aluminium and nickel
Leed and tin
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Question # 8
A system is said to be in the colloidal state if the particle size of the dispersed phase ranges from
Choose an answer
o
I to 10 A
10 to 10000 A
10 to 100 A
1000 to 10000 A
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Question # 9
The depolarizer used in dry cell batteries in.
Choose an answer
NH4Cl
MnO2
KOH
Na2PO4
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Question # 10
The migration of positively charged colloidal particles, under an electrical field , towards the cathode is called.
Choose an answer
Cataphoresis
Electroamosis
Sedimentation
Electrodialysis
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Question # 11
The flow of solvent into a solution when two are separated by a semi -permeable membrane is called.
Choose an answer
Mixing
Effusion
Diffusion
Osmosis
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Question # 12
Equilibrium constant Kp and Kc are related as
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Kc = Kp (RT)delta n
Kp = Kc (RT)an
Kp = (Kc/RT)delta n
Kp -Kc = (RT)delta n
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Question # 13
If there are only two components in a solution with mole fraction X
A
and X
B
then which of the following relation is correct.
Choose an answer
X
A
+ X
B
= 0
X
A
+ X
B
> 1
XA = XB < 1
XA = 1 - XB
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Question # 14
The particle motion in solids is
Choose an answer
Only vibratory
Only translator
Vibratory and rotatory
Only translatory
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Question # 15
Which parameter of a chemical reaction will change with the use of a catalyst.
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Delta F, change in free energy
Delta S, change in entropy
Delta E , change in internal energy
K, the rate constant
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Question # 16
Which of the following expression is correct.
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C = n/RT
C = RT/n
RT = Cn
Cn = 1/RT
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Question # 17
Which of the following should have the largest dipole moment.
Choose an answer
Carbon tetrachloride
Cis-stibeue
Trans-atibeue
Cis-dichlorocthylene
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Question # 18
The sum of pH and pOH is aqueous solution is equal to.
Choose an answer
14
7
zero
pKw
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Question # 19
They hydrolysis of methly acetate is a reaction of.
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First order
Second order
Third oirder
Fourth order
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Question # 20
Concentration polarization arises because of the
Choose an answer
Different concentrations of solutions in the two half cells
Changes in the concentration of electrolyte around the electrode from bulk concentration
Reversible nature of the cell
Variation in temperature during measurements
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Question # 21
Which of the following is always true for the adiabatic expansion of gas.
Choose an answer
Temperature rises
Pressure rises
W=0
Q = 0
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