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Chemistry Fsc Part 1 Online Test MCQs With Answers
Question # 1
Alkali and alkaline earth metal are usually obtained by
Choose an answer
Decomposition of their carbonates
By heating their hydroxide
electrolysis of molten metal oxides
Electrolysis of molten metal halides
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Question # 2
Molecule in which the distance between two carbon atoms in the largest is.
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C2H6
C2H4
C2H2
C6H6
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Question # 3
With increase in 10°C temperature, the rate of reaction double. This increase in rate of reaction is due to
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Decrease in activation energy of reaction
Decrease in the number of collisions between reactant molecules
Increases in activation energy of reactants
Increase in number of effect collisions
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Question # 4
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 # 5
The deviation of a gas from ideal behavior is maximum at.
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-10
o
C and 5.0 atm
-10
o
C and 2 atm
0
o
C and 2 atm
100
o
C and 2 atm
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Question # 6
Which one of the following inter molecular forces are present in neon gas molecules.
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Hydrogen bond
dipole -Dipole attraction
London dispersion force
Hydrogen bonding and London dispersion force
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Question # 7
The molar volume of CO2 is maximum at.
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STP
127
o
C and 1 atm
0
o
C and 2 atm
273
o
C and 2 atm
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Question # 8
Dipole-dipole forces are present among.
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Molecules of Iodine
Atoms of Neon i gaseous state
Chloroforms' molecules
CCl4 molecules
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Question # 9
The Avogadro constant is the number of.
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Atoms in 1 g of helium ga
Molecules in 35.5 g of chlorine gas
Atoms in 6 h graphite
Atoms in 24 g of magnesium
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Question # 10
Both CH4 and NH3 are four electron pair system the angles of CH4 and NH3 are 109.5
o
and 107.5
o
respectively. This deviation is due to.
Choose an answer
Hydrogen bonding in ammonia
Lone pair attraction
Lone pair occupy more space and repel to other bond pairs
Lone pair lone pair repulsion
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Question # 11
The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is known as
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Henry's law
Hess's law
Joule's principle
Law of conservation of energy
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Question # 12
One of the following statements about Born-Haber cycle is correct. Which is that statement
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Born-Haber cycle is different from Hess's law
The energy change in a cyclic process is not zero
The lattice energy of the crystalline substances can be calculated easily
Heat of formation of the product and the lattice energy of the substance can be calculated simultaneously
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Question # 13
Which of the following statement is contrary to the first law of thermodynamics
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An equivalent amount of heart energy can neither be created nor destroyed
One form of energy can be transferred into an equivalent amount of other kinds of energy
In an adiabatic process, the work done is independent of its path
Continuous production of mechanical work without supplying an equivalent is amount of heat possible
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Question # 14
The mathematical relation between the rate of reaction and the concentrations of the reactants is known as the
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Rate equation
Rate law
Arrhenius equation
Both a and b
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Question # 15
A substance which rerareds the rate of a reaction is called
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Inhibitor
Activator
Auto-catalyst
None of these
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Question # 16
The ration of number of molecules of 2 g H2 g to number of molecules of 64 g gaseous oxygen is.
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1:1
1:2
1:32
1:4
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Question # 17
Which substances has diffused melting point.
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Crystalline solids
Amorphous solids
Metallic solids
Covalent solids
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Question # 18
A molecular orbital can accommodate maximum electron
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2
6
8
10
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