NEET Chemistry Chapter Wise Mock Test – Chemical Thermodynamics
For which process change in internal energy and enthalpy is zero?
(a) Cyclic process
(b) Reversible process
(c) Isochoric process
(d) Isobaric process
Work done by system is equaj^to the same extent as the internal energy of an ideal- gas decreases, the process is
In a process 701 J of heat is absorbed by a system and 394 J of work is done by the system. The change in internal energy for the process will be
(a) 307 J
(b) 502 J
(c) 701 J
(d) -394 J
The heat of combustion of carbon to C02 is -393 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is
(a) + 315 kJ
(b) -31.5 kJ
Enthalpy change for a reaction does not depend upon
(a) the physical states of reactants and products
(b) use of different reactants for the same product
(c) the nature of intermediate reaction steps
(d) the differences in initial or final temperature of involved substances
The volume of gas is reduced to half from its original volume. The specific heat will be [NCERT Exemplar]
(a) reduced to half
(c) remains constant
(d) increases 4 times
Maximum entropy will be in which of the following?
(b) Liquid water
(d) Water vapours
Identify the correct statement regarding entropy.
(a) At 0°C, the entropy of a perfectly crystalline substance is taken to be zero
(b) At absolute zero of the temperature, the entropy of all perfectly crystalline substance is positive
(c) At absolute zero of temperature, the entropy of all crystalline substance is taken to be zero
(d) At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero
Direction (Q. NOS. 39-40) In the following questions more than one of the answers given may be correct. Select the correct answers and mark it according to the codes.
(a) 1, 2 and 3 are, correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct
The following is (are) endothermic reaction(s)
1. decomposition of water
2. dehydrogenation of ethane to ethylene
3. conversion of graphite to diamond
4. combustion of methane
Direction (Q. Nos. 43-47) Each of these questions contains two statements : Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c),and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true
Assertion The mass and volume of a substance are the extensive properties and are proportional to each other.
Reason The ratio of mass of a sample to its volume is an intensive property.
Assertion For isothermal expansion of an ideal gas, its enthalpy decreases.
Reason Enthalpy does not depend upon temperature.
Assertion Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason Decrease in enthalpy is a contributor for spontaneity.
Assertion The heat adsorbed during isothermal expansion of an ideal gas against vacuum is zero.
Reason The volume occupied by the molecule is zero
Which of the following is an intensive property?
(c) Surface tension
(d) All of these
Work done during isothermal expansion of one mole of an ideal gas from 10 atm to 1 atm at 300 K is
(a) 4938.8 J
(b) 4138.8 J
(c) 5744.1 J
(d) 6257.2 J
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