## CHEMISTRY THERMODYNAMICS QUIZ-4

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.
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Q1.Which of the following reaction is endothermic?:
•  CaCO3 ⟶ CaO+CO2
•  Fe+S → FeS
•  NaOH+HCl → NaCl+H2O
•  CH4+2O2 → CO2+2H2O
Solution
Dissociation of CaCO3 required energy
Q2.Entropy of system depends upon
•  Volume only
•  Temperature only
•  Pressure only
•  Pressure, volume, and temperature
Solution
Entropy of system depends upon Pressure, volume, and temperature
Q3.When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm changes volume from 1 L to 2 L. The final temperature in Kelvin would be
•  T/22/3
•  T + 2/(3×0.0821)
•  T
•  T - 2/(3×0.0821)
Solution

Q4.H2(g) + 1/2O2(g) → H2O(l)
BE(H-H) = x1; BE(O=O) = x2
BE(O-H) = x3
Latent heat of vaporization of water liquid into water vapour = x4, then ∆fH (heat of formation of liquid water)is
•  x1 + x2/2 - x3 + x4
•  2x3 - x1 - x2/2 - x4
•  x1 + x2/2 - 2x3 - x4
•  x1 + x2/2 - 2x3+ x4
Solution
∆H = BE(reactant) - BE(products)
[But all the species must be in gaseous state. In product,
Hence, H2(g) + 1/2O2(g)→H2O(l)
∆H=[(BE)H-H + 1/2(BE)O=O]
=[(∆H)vap + 2(BE)O-H]
=x1 + x2/2 - [x4 + 2x3]
=x1 + x2/2 - x4 - 2x3

Q5.Evaporation of water is
•  An exothermic change
•  An endothermic change
•  A process where no heat changes occur
•  A process accompanied by chemical reaction
Solution
Evaporation of water required heat energy to proceed the reaction

Q6.In thermodynamics, a process is called reversible when
•  The surroundings and the system change into each other
•  There is no boundary between the system and the surroundings
• The surroundings are always in equilibrium with the system
•  The system changes into the surroundings spontaneously
Solution
In thermodynamics, a process is called reversible when the surroundings are always in equilibrium with the system

Q7.Which of the following equations corresponds to the enthalpy of combustion at 298 K?
•  C2H6(g)+ 7/2O2(g) → 2CO2(g) + 3H2O(g)
•  2C2H6(g)+ 7O2(g) → 4CO2(g) + 6H2O(g)
•  C2H6(g)+ 7/2O2(g) → 2CO2(g) + 3H2O(l)
•  2C2H6(g)+ 7O2(g) → 4CO2(g) + 6H2O(l)
Solution
Combustion of one mole of reactants gives products in standard state or most stable state

Q8.If a certain mass of gas is made to undergo separately adiabatic and isothermal expansions to the same pressure, starting from the same initial conditions of temperature and pressure, then, as compared to that of isothermal expansion, in the case of adiabatic expansion, the final
•  Volume and temperature will be higher
•  Volume and temperature will be lower
•  Temperature will be lower but the final volume will be higher
•  Volume will be lower but the final volume will be higher
Solution
Volume and temperature will be lower

Q9.Which of the following is an endothermic reaction?
•  2H2 + O2 → 2H2O
•  N2 + O2 → 2NO
•  2NaOH + H2SO4 → Na2SO4 + 2H2O
•  C2H5OH + 3O2 ⟶ 2CO2 + 3H2O
Solution
2H2 + O2 → 2H2O

Q10. The expression ∆sublH = ∆fusH + ∆vapH is true at all
•  Temperatures
•  Pressures
•  Temperatures and pressures
•  Temperatures and 1 atm pressure conditions
Solution
Temperatures and 1 atm pressure conditions

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