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MDCAT Chemistry Chapter 7 Reaction Kinetics Online Test MCQs With Answers
Question # 1
According to Hess's law, the enthalpy change for a reaction
Choose an answer
Depends on path
Independent of the path
The sum of ∆E and ∆H
None of these
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Question # 2
One kilo calorie is equal to
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4.184J
1000J
4184J
1kJ
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Question # 3
Total heat content of a system is called
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Internal energy
Entropy
Enthalpy
All of these
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Question # 4
The measurement of enthalpy change at standard conditions means that we should manage the measurement at
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24°C at 1 atm
25°C at 1 atm
0C° at 1 atm
100C° 1 atm
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Question # 5
The enthalpies of all elements in their standard states are
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Unity
always +ve
always -ve
zero
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Question # 6
In order to determine ∆H (latt) of ionic compound which is correct relationship
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∆H latt. = ∆Hf - ∆Hx
∆H latt. = ∆Ha + ∆Hv
∆H latt. = ∆Hf + ∆Hx
∆H latt. = ∆Hf - ∆H sol.
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Question # 7
A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is
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50kJ
100 kJ
150kJ
5000 kJ
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Question # 8
Born-Haber cycle is an application of
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Hess's law
1" law of thermodynamics
Avogadro's law
1law of thermochemistry
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Question # 9
The change in enthalpy when one mole of a substance is dissolved in a specified quantity of solvent at a given temperature is called
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Heat of reaction
Heat of solvation
Heat of combustion
Heat of solvent
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Question # 10
One of the best applications of Hess's law to calculate the lattice energy of ionic compound is
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Measurement of enthalpy change in a calorimeter
Studying of first law of thermodynamics
Measurement of a heat of formation of a compound
Born-Haber cycle
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Question # 11
The enthalpy of formation of a compound is
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Positive
Either positive or negative
Negative
None
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Question # 12
The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of
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Fomation of CO2
Fusion ofC2H4
Combustion of C2H4
Vaporization of C2H2
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Question # 13
The value of ∆V being very small. The term P∆V can be neglected for process involving
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Liquid and gas
Solids and gases
Liquid and solid
None of these
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Question # 14
The net heat change in a chemical reaction is the 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 law
Law of conservation of energy
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Question # 15
Neutralization of acid-base is
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Spontaneous
Exothermic
Non spontaneous
Both "a" and "c
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Question # 16
Change in enthalpy (∆H) of a system can be calculated by
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∆H=∆E - PV
ΔH =ΔE +q
∆H = ∆E - q
∆Η = ΔΕ + P∆V
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Question # 17
Which of the following enthalpy change always have a negative value
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∆Hf
∆H sol
∆Hc
∆Hat
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Question # 18
By convention, the standard heat of formation of all elements is assumed to be
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Zero
positive
Negative
Infinity
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Question # 19
Which of the following processes has always. ∆H=-ve
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Formation of compound
Dilution of a solution
Dissolution of ionic compound
Combustion
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Question # 20
ΔH° represent the enthalpy change at
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0°C and 1 atm pressure
25°Cand 1atm
0K and I atm pressure
25°C and 2 atm pressure
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