4141. At the critical point of a substance
A. The surface tension vanishes
B. Liquid and vapour have the same density
C. There is no distinction between liquid and vapour phases
D. All of the above
✅ The correct answer is option D.
Chemical Engineering
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4142. In the reaction, C + O₂ → CO₂ ; ΔH = – 94 kcal. What is the heat content (enthalpy)of O₂?
A. -94 kcal
B. > -94 kcal
C. < - 94 kcal
D. Zero
✅ The correct answer is option D.
4143. Law of corresponding states says that
A. , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
B. The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
C. No gas can be liquified above the critical temperature, howsoever high the pressure may be
D. The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)
✅ The correct answer is option A.
4144. Internal energy is equal to the heat absorbed in case of a/an __________ process.
A. Constant volume
B. Polytropic
C. Adiabatic
D. Constant pressure
✅ The correct answer is option A.
4145. In which of the following reaction equilibria, the value of equilibrium constant Kp will be more than is Kc?
A. 2HI ⇋ H₂ + I₂
B. N₂O₄ ⇋ 2NO₂
C. 2SO₂ + O₂ ⇋ 2SO₃
D. None of these
✅ The correct answer is option B.
4146. At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is
A. Zero
B. One
C. Infinity
D. Negative
✅ The correct answer is option B.
4147. Water on heating from 1 to 4°C
A. Contracts
B. Expands
C. Has same volume
D. May contract or expand
✅ The correct answer is option A.
4148. Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.
A. 1st
B. Zeroth
C. 3rd
D. None of these
✅ The correct answer is option B.
4149. At absolute zero temperature, all substances have the same
A. Heat capacity
B. Crystalline structure
C. Entropy
D. None of these
✅ The correct answer is option A.
4150. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is
A. More in vapour phase
B. More in liquid phase
C. Same in both the phases
D. Replaced by chemical potential which is more in vapour phase
✅ The correct answer is option C.