3984. The kinetic energy of gas molecule is zero at
A. 0°C
B. 273°C
C. 100°C
D. -273°C
✅ The correct answer is option D.
3989. The compressibility factor of a gas is given by (where, V₁ = actual volume of the gas V₂ = gas volume predicted by ideal gas law )
A. V₁/V₂
B. V₂/V₁
C. V₁-V₂
D. V₁.V₂
✅ The correct answer is option A.
3994. Degree of freedom of a system consisting of a gaseous mixture of H₂ and NH₃ will be
A. 0
B. 1
C. 2
D. 3
✅ The correct answer is option D.
3999. The first law of thermodynamics is a restatement of the law of conservation of
A. Mass
B. Energy
C. Momentum
D. None of these
✅ The correct answer is option B.
4006. In the reaction; N₂ + O₂ ⇋ 2NO, increasing the pressure will result in
A. Shifting the equilibrium towards right
B. Shifting the equilibrium towards left
C. No change in equilibrium condition
D. None of these
✅ The correct answer is option C.
4012. When a system is in equilibrium for all possible processes, the differential or finite change of entropy is
A. < 0
B. > 0
C. = 0
D. None of these
✅ The correct answer is option A.
3979. Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature.
A. Below
B. At
C. Above
D. Either B or C
✅ The correct answer is option A.
3985. When dilute aqueous solutions of two salts are mixed, the process is associated with
A. Decrease in temperature
B. Increase in temperature
C. No change in temperature
D. Change in temperature which is a function of composition
✅ The correct answer is option B.
3990. The absolute entropy for all crystalline substances at absolute zero temperature is
A. Zero
B. Negative
C. More than zero
D. Indeterminate
✅ The correct answer is option A.
3995. Melting of ice is an example of an __________ process.
A. Adiabatic
B. Isothermal
C. Isometric
D. None of these
✅ The correct answer is option B.