Third law of thermodynamics provides a method to evaluate which property?
  • Absolute Energy
  • Absolute Enthalpy
  • Absolute Entropy
  • Absolute Free Energy
One mole of which of the following has the highest entropy?
  • Liquid Nitrogen
  • Hydrogen Gas
  • Mercury
  • Diamond
The enthalpy of vaporisation of a substance is 8400 J mol
  • 84 J mol
  • 21 J mol
  • 49 J mol
  • 12 J mol
The species which by definition has ZERO standard molar enthalpy of formation at 298 K is
  • Br
  • Cl
  • H
  • CH
In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?
  • 850 kJ
  • 600 kJ
  • 350 kJ
  • 250 kJ
Which of the following is true for the reaction? H
  • ∆S = 0
  • ∆H = T ∆S
  • ∆H = ∆U
  • ∆H = 0
Calculate the heat required to make 6.4 Kg CaC2 from CaO(s) and C(s) from the reaction: CaO(s) + 3 C(s) → CaC2(s) + CO (g) given that ∆f Ho (CaC2) = -14.2 kcal. ∆f H° (CO) = -26.4 kcal.
  • 5624 kcal
  • 1.11 × 104 kcal
  • 86.24 × 10³
  • 1100 kcal
In a system where ∆E = -0 kJ, a piston expanded against a p
  • -36 kJ
  • -13 kJ
  • -47 kJ
  • 24 kJ
A system absorb 10 kJ of heat at constant volume and its temperature rises from 270 C to 370 C. The value of ∆ U is
  • 100 kJ
  • 10 kJ
  • 0 kJ
  • 1 kJ
An ideal gas is taken around the cycle ABCA as shown in P-V diagram The next work done by the gas during the cycle is equal to:
  • 12P
  • 6P
  • 5P
  • P
In which of the following process, a maximum increase in entropy is observed?
  • Dissolution of Salt in Water
  • Condensation of Water
  • Sublimation of Naphthalene
  • Melting of Ice
The bond energy (in kcal mol
  • 1
  • 10
  • 83-85
  • 1000
Which thermodynamic function accounts automatically for enthalpy and entropy both?
  • Helmholtz Free Energy (A)
  • Internal Energy (E)
  • Work Function
  • Gibbs Free Energy
The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283.0 kJ mol-1 respectively. The enthalpy of formation of carbon monoxide is:
  • -676 kJ
  • 110.5 kJ
  • -110.5 kJ
  • 676.5 kJ
The enthalpy of formation of carbon monoxide is:
  • -676 kJ
  • 110. 5 kJ
  • -110. 5 kJ
  • 676. 5 kJ
The amount of the heat released when 20 ml5 M NaOH is mixed with 100 ml1 M HCl is x kJ. The heat of neutralization is
  • -100 × kJ/mol
  • -50 × kJ/mol
  • 100 × KJ/mol
  • 50 × kJ/mol
Based on the first law of thermodynamics, which one of the following is correct?
  • For an isothermal process, q = +w
  • For an isochoric process, ΔU = -q
  • For an adiabatic process, ΔU = -w
  • For a cyclic process, q = -w
A system absorb 10 kJ of heat at constant volume and its temperature rises from 270°C to 370°C. The value of ∆ U is
  • 100 kJ
  • 10 kJ
  • 0 kJ
  • 1 kJ
The temperature of the system decreases in an ______.
  • Adiabatic Compression
  • Isothermal Expansion
  • Isothermal Compression
  • Adiabatic Expansion
Which of the following salts will have maximum cooling effect when5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt?
  • KNO
  • NaCl (∆H = 5. 35 kJ mol
  • HBr (∆H = -83. 3 kJ mol
  • KOH ( ∆H = -55. 6 kJ mol
0 h : 0 m : 1 s

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