MCQOPTIONS
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MCQOPTIONS
This section includes 838 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
dW and dq are not the exact differential, because q and W are |
| A. | State functions |
| B. | Path functions |
| C. | Intensive properties |
| D. | Extensive properties |
| Answer» C. Intensive properties | |
| 302. |
Third law of thermodynamics is helpful in |
| A. | Prediction of the extent of a chemical reaction |
| B. | Calculating absolute entropies of substances at different temperature |
| C. | Evaluating entropy changes of chemical reaction |
| D. | Both B and C |
| Answer» E. | |
| 303. |
At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the |
| A. | Third law of thermodynamics |
| B. | Second law of thermodynamics |
| C. | Nernst heat theorem |
| D. | Maxwell's relations |
| Answer» B. Second law of thermodynamics | |
| 304. |
Which of the following decreases with increase in pressure? |
| A. | Melting point of ice |
| B. | Melting point of wax |
| C. | Boiling point of liquids |
| D. | None of these |
| Answer» B. Melting point of wax | |
| 305. |
In the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl₂, decrease in the pressure of the system will __________ the degree of dissociation of PCl5. |
| A. | Increase |
| B. | Decrease |
| C. | Not alter |
| D. | None of these |
| Answer» B. Decrease | |
| 306. |
Forward reaction will be favoured for the exothermic reaction, represented by CO + H₂O ⇋ CO₂ + H₂, by |
| A. | Low temperature and high pressure |
| B. | Low temperature and low pressure |
| C. | High temperature and high pressure |
| D. | High temperature and low pressure |
| Answer» B. Low temperature and low pressure | |
| 307. |
Which of the following is not affected by temperature changes? |
| A. | Fugacity |
| B. | Activity co-efficient |
| C. | Free energy |
| D. | None of these |
| Answer» E. | |
| 308. |
Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole. |
| A. | 0 |
| B. | 273 |
| C. | 25 |
| D. | None of these |
| Answer» B. 273 | |
| 309. |
The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ - T₂)/T₁. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T₁ and T₂ is given by |
| A. | T₁/(T₁-T₂) |
| B. | T₂/(T₁-T₂) |
| C. | T₁/T₂ |
| D. | T₂/R1 |
| Answer» B. T₂/(T₁-T₂) | |
| 310. |
With increase in pressure (above atmospheric pressure), the Cp of a gas |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | First decreases and then increases |
| Answer» B. Decreases | |
| 311. |
As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | None of these |
| Answer» B. Unity | |
| 312. |
Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is |
| A. | 300(32/7) |
| B. | 300(33/5) |
| C. | 300(33/7) |
| D. | 300(35/7) |
| Answer» B. 300(33/5) | |
| 313. |
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 |
| Answer» B. V₂/V₁ | |
| 314. |
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl₂.Degree of dissociation of PCl5 will |
| A. | Decrease on addition of Cl₂ |
| B. | Increase on addition of an inert gas at constant pressure |
| C. | Decrease on increasing the pressure of the system |
| D. | None of these |
| Answer» E. | |
| 315. |
As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches |
| A. | Unity |
| B. | Zero |
| C. | That of the heat of reaction |
| D. | Infinity |
| Answer» C. That of the heat of reaction | |
| 316. |
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 |
| Answer» C. 2SO₂ + O₂ ⇋ 2SO₃ | |
| 317. |
Work done in case of free expansion is |
| A. | Indeterminate |
| B. | Zero |
| C. | Negative |
| D. | None of these |
| Answer» C. Negative | |
| 318. |
Which of the following is a thermodynamic property of a system? |
| A. | Concentration |
| B. | Mass |
| C. | Temperature |
| D. | Entropy |
| Answer» E. | |
| 319. |
Dry ice is |
| A. | Moisture free ice |
| B. | Solid helium |
| C. | Solid carbon dioxide |
| D. | None of these |
| Answer» D. None of these | |
| 320. |
In the reaction, represented by, 2SO₂ + O₂ ⇋ 2SO₃; ΔH = - 42 kcal; the forward reaction will be favoured by |
| A. | Low temperature |
| B. | High pressure |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 321. |
PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process. |
| A. | Isothermal |
| B. | Isentropic |
| C. | Isobaric |
| D. | Adiabatic |
| Answer» E. | |
| 322. |
Cv for an ideal gas |
| A. | Does not depend upon temperature |
| B. | Is independent of pressure only |
| C. | Is independent of volume only |
| D. | Is independent of both pressure and volume |
| Answer» E. | |
| 323. |
A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is |
| A. | 349 |
| B. | 651 |
| C. | 667 |
| D. | 1000 |
| Answer» B. 651 | |
| 324. |
At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by(where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) |
| A. | μ° + RT ln f |
| B. | μ°+ R lnf |
| C. | μ° + T lnf |
| D. | μ° + R/T lnf |
| Answer» B. μ°+ R lnf | |
| 325. |
Which is an example of closed system? |
| A. | Air compressor |
| B. | Lquid cooling system of an automobile |
| C. | Boiler |
| D. | None of these |
| Answer» C. Boiler | |
| 326. |
Which of the following is affected by the temperature? |
| A. | Fugacity |
| B. | Activity co-efficient |
| C. | Free energy |
| D. | All of the above |
| Answer» E. | |
| 327. |
What happens in a reversible adiabatic expansion process? |
| A. | Heating takes place |
| B. | Cooling takes place |
| C. | Pressure is constant |
| D. | Temperature is constant |
| Answer» C. Pressure is constant | |
| 328. |
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) |
| Answer» B. The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature | |
| 329. |
For an ideal liquid solution, which of the following is unity? |
| A. | Activity |
| B. | Fugacity |
| C. | Activity co-efficient |
| D. | Fugacity co-efficient |
| Answer» D. Fugacity co-efficient | |
| 330. |
Cv is given by |
| A. | (∂E/∂T)V |
| B. | (∂E/∂V)T |
| C. | (∂E/∂P)V |
| D. | (∂V/∂T)P |
| Answer» B. (∂E/∂V)T | |
| 331. |
Grams of butane (C₄H₁₀) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be |
| A. | 580 |
| B. | 640 |
| C. | 1160 |
| D. | Data insufficient; can't be computed |
| Answer» D. Data insufficient; can't be computed | |
| 332. |
In case of the decomposition of hydroiodic acid (2HI ⇋ H₂ + I₂), addition of H₂ (at equilibrium condition) will |
| A. | Increase the partial pressure of I₂ |
| B. | Decrease the partial pressure of HI |
| C. | Diminish the degree of dissociation of HI |
| D. | None of these |
| Answer» D. None of these | |
| 333. |
The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzman's constant, T = absolute temperature) |
| A. | √(2KT/m) |
| B. | √(3KT/m) |
| C. | √(6KT/m) |
| D. | 3KT/m |
| Answer» C. √(6KT/m) | |
| 334. |
A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c. |
| A. | 2.73 |
| B. | 28.3 |
| C. | 273 |
| D. | 283 |
| Answer» C. 273 | |
| 335. |
The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is |
| A. | ∞ |
| B. | 1 |
| C. | 0 |
| D. | -ve |
| Answer» D. -ve | |
| 336. |
Trouton's ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K ) |
| A. | λb/Tb |
| B. | Tb/λb |
| C. | √(λb/Tb) |
| D. | √(Tb/λb) |
| Answer» B. Tb/λb | |
| 337. |
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)S and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ) |
| A. | (∂P/∂V)S = (∂P/∂V)T |
| B. | (∂P/∂V)S = [(∂P/∂V)T]Y |
| C. | (∂P/∂V)S = y(∂P/∂V)T |
| D. | (∂P/∂V)S = 1/y(∂P/∂V)T |
| Answer» D. (∂P/∂V)S = 1/y(∂P/∂V)T | |
| 338. |
The expression for entropy change given by, ΔS = nR ln (V₂/V₁) + nCv ln (T₂/T₁) is valid for |
| A. | Reversible isothermal volume change |
| B. | Heating of a substance |
| C. | Cooling of a substance |
| D. | Simultaneous heating and expansion of an ideal gas |
| Answer» E. | |
| 339. |
In the reaction, H₂ +I₂ ⇋ 2HI, addition of an inert gas will |
| A. | Increase the partial pressure of H₂ |
| B. | Increase the partial pressure of I₂ |
| C. | Increase the total pressure and hence shift the equilibrium towards the right |
| D. | Not effect the equilibrium conditions |
| Answer» E. | |
| 340. |
Entropy change of the reaction, H₂O(liquid) H₂O(gas), is termed as the enthalpy of |
| A. | Solution |
| B. | Vaporisation |
| C. | Formation |
| D. | Formation |
| Answer» C. Formation | |
| 341. |
The thermodynamic law, PVy = constant, is not applicable in case of |
| A. | Ideal compression of air |
| B. | Free expansion of an ideal gas |
| C. | Adiabatic expansion of steam in a turbine |
| D. | Adiabatic compression of a perfect gas |
| Answer» C. Adiabatic expansion of steam in a turbine | |
| 342. |
The expression, ΔG = nRT .In P₂/P₁ , gives the free energy change |
| A. | With pressure changes at constant temperature |
| B. | Under reversible isothermal volume change |
| C. | During heating of an ideal gas |
| D. | During cooling of an ideal gas |
| Answer» B. Under reversible isothermal volume change | |
| 343. |
If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law. |
| A. | Hess's |
| B. | Kirchoff's |
| C. | Lavoisier and Laplace |
| D. | None of these |
| Answer» B. Kirchoff's | |
| 344. |
When pressure is applied on the system, ice ⟷ water, then |
| A. | Equilibrium can not be established |
| B. | More ice will be formed |
| C. | More water will be formed |
| D. | Evaporation of water will take place |
| Answer» D. Evaporation of water will take place | |
| 345. |
For a constant pressure reversible process, the enthalpy change (ΔH) of the system is |
| A. | Cv.dT |
| B. | Cp.dT |
| C. | ∫Cp.dT |
| D. | ∫Cv.dT |
| Answer» D. ∫Cv.dT | |
| 346. |
Which is not a refrigerant? |
| A. | SO₂ |
| B. | NH₃ |
| C. | CCl₂F₂ |
| D. | C₂H₄Cl₂ |
| Answer» E. | |
| 347. |
Which is a state function? |
| A. | Specific volume |
| B. | Work |
| C. | Pressure |
| D. | Temperature |
| Answer» C. Pressure | |
| 348. |
Water on heating from 1 to 4°C |
| A. | Contracts |
| B. | Expands |
| C. | Has same volume |
| D. | May contract or expand |
| Answer» B. Expands | |
| 349. |
For the gaseous phase chemical reaction, C₂H₄(g) + H₂O(g) ⟷ C₂H₅OH(g), the equilibrium conversion does not depend on the |
| A. | Steam to ethylene ratio |
| B. | Temperature |
| C. | Pressure |
| D. | None of these |
| Answer» E. | |
| 350. |
If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will |
| A. | Increase |
| B. | Decrease |
| C. | Remain unaltered |
| D. | Increase or decrease ; depends on the particular reaction |
| Answer» D. Increase or decrease ; depends on the particular reaction | |