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.
| 101. |
The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the __________ of a substance. |
| A. | simultaneous pressure & temperature change |
| B. | heating |
| C. | cooling |
| D. | both (b) and (c) |
| Answer» E. | |
| 102. |
The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for |
| A. | expansion of a real gas. |
| B. | reversible isothermal volume change. |
| C. | heating of an ideal gas. |
| D. | cooling of a real gas. |
| Answer» C. heating of an ideal gas. | |
| 103. |
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. | |
| 104. |
What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR(where, T1 and T2 are source & surrounding temperatures respectively.)? |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | none of these |
| Answer» B. [B]. | |
| 105. |
The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» C. [C]. | |
| 106. |
Sublimation temperature of dry ice (solid CO2) is __________ °C. |
| A. | -273 |
| B. | 0 |
| C. | -78 |
| D. | 5 |
| Answer» D. 5 | |
| 107. |
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 | |
| 108. |
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 |
| Answer» E. | |
| 109. |
Consider the reaction, C + O2 CO2 ;ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO2 C + O2 ? |
| A. | -94 kcal |
| B. | + 94 kcal |
| C. | > 94 kcal |
| D. | < -94 kcal |
| Answer» C. > 94 kcal | |
| 110. |
The ammonia synthesis reaction represented by N2 + 3H2 2NH3 ; ΔH = - 22.4 kcal, is |
| A. | endothermic |
| B. | exothermic |
| C. | isothermal |
| D. | adiabatic |
| Answer» C. isothermal | |
| 111. |
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) | |
| 112. |
Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm). |
| A. | Pressure must be kept below 5.2 atm. |
| B. | Temperature must be kept above - 57°C. |
| C. | Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C. |
| D. | Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively. |
| Answer» E. | |
| 113. |
If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) C3H8(g) will be __________ Kcal. |
| A. | -19.4 |
| B. | -30.2 |
| C. | 55.2 |
| D. | -55.2 |
| Answer» B. -30.2 | |
| 114. |
Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» B. [B]. | |
| 115. |
The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv), depends upon its |
| A. | ressure |
| B. | olume |
| C. | emperature |
| D. | ll of the above |
| Answer» D. ll of the above | |
| 116. |
In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process. |
| A. | diabatic |
| B. | sometric |
| C. | sentropic |
| D. | sothermal |
| Answer» C. sentropic | |
| 117. |
When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the |
| A. | e-Chatelier principle |
| B. | opp's rule |
| C. | aw of corresponding state |
| D. | rrehenius hypothesis |
| Answer» B. opp's rule | |
| 118. |
The expression for entropy change, ΔS = n Cp . ln (T₂/T₁), is valid for the __________ of a substance. |
| A. | imultaneous pressure & temperature change |
| B. | eating |
| C. | ooling |
| D. | oth B and C |
| Answer» E. | |
| 119. |
Which of the following equations is used for the prediction of activity co-efficient from experiments? |
| A. | an Laar equation |
| B. | argules equation |
| C. | ilson's equation |
| D. | ll of the above |
| Answer» E. | |
| 120. |
1/V (∂V/∂T)p is the mathematical expression |
| A. | oule-Thomson co-efficient |
| B. | pecific heat at constant pressure (Cp) |
| C. | o-efficient of thermal expansion |
| D. | pecific heat at constant volume (CV) |
| Answer» D. pecific heat at constant volume (CV) | |
| 121. |
A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of |
| A. | emperature only |
| B. | emperature and pressure only |
| C. | emperature, pressure and liquid composition xi only |
| D. | emperature, pressure, liquid composition xi and vapour composition yi |
| Answer» D. emperature, pressure, liquid composition xi and vapour composition yi | |
| 122. |
(∂T/∂P)H is the mathematical expression for |
| A. | pecific heat at constant pressure (Cp) |
| B. | pecific heat at constant volume (Cv) |
| C. | oule-Thompson co-efficient |
| D. | one of these |
| Answer» D. one of these | |
| 123. |
(∂H/∂T)p is the mathematical expression for |
| A. | V |
| B. | ntropy change |
| C. | ibbs free energy |
| D. | one of these |
| Answer» E. | |
| 124. |
(∂E/∂T)V is the mathematical expression for |
| A. | V |
| B. | nthalpy change |
| C. | ree energy change |
| D. | one of these |
| Answer» E. | |
| 125. |
The value of Cp & Cv respectively for monoatomic gases in Kcal/kg Mole . °K are |
| A. | & 3 |
| B. | .987 & 1.987 |
| C. | .987 & 0.66 |
| D. | .66 & 1.987 |
| Answer» B. .987 & 1.987 | |
| 126. |
In which of the following reaction equilibria, the value of equilibrium constant Kp will be more than is Kc? |
| A. | HI ⇋ H₂ + I₂ |
| B. | ₂O₄ ⇋ 2NO₂ |
| C. | SO₂ + O₂ ⇋ 2SO₃ |
| D. | one of these |
| Answer» C. SO₂ + O₂ ⇋ 2SO₃ | |
| 127. |
PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process. |
| A. | sothermal |
| B. | sentropic |
| C. | sobaric |
| D. | diabatic |
| Answer» E. | |
| 128. |
Forward reaction will be favoured for the exothermic reaction, represented by CO + H₂O ⇋CO₂ + H₂, by |
| A. | ow temperature and high pressure |
| B. | ow temperature and low pressure |
| C. | igh temperature and high pressure |
| D. | igh temperature and low pressure |
| Answer» B. ow temperature and low pressure | |
| 129. |
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect? |
| A. | apor compression cycle using expansion valve |
| B. | ir refrigeration cycle |
| C. | apor compression cycle using expansion engine |
| D. | arnot refrigeration cycle |
| Answer» E. | |
| 130. |
The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the |
| A. | ewis-Randall rule |
| B. | tatement of Vant-Hoff equation |
| C. | e-Chatelier's principle |
| D. | one of these |
| Answer» E. | |
| 131. |
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 | |
| 132. |
The expression for entropy change given by, ΔS = nR ln (V₂/V₁) + nCv ln (T₂/T₁) is valid for |
| A. | eversible isothermal volume change |
| B. | eating of a substance |
| C. | ooling of a substance |
| D. | imultaneous heating and expansion of an ideal gas |
| Answer» E. | |
| 133. |
Entropy change of the reaction, H₂O(liquid)H₂O(gas), is termed as the enthalpy of |
| A. | olution |
| B. | aporisation |
| C. | ormation |
| D. | ormation |
| Answer» C. ormation | |
| 134. |
The accentric factor of a materical, 'ω', is defined as ω = -log10(Prsat)Tr⁻¹ = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always |
| A. | 2 |
| B. | 1 |
| C. | 1 |
| D. | 3 |
| Answer» C. 1 | |
| 135. |
The equation relating E, P, V and T which is true for all substanes under all conditions is given by (∂E/∂V)T = T.(∂P/∂T)H - P . This equation is called the |
| A. | axwell |
| B. | hermodynamic equation of state |
| C. | quation of state |
| D. | edlich-Kwong equation of state |
| Answer» C. quation of state | |
| 136. |
"A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is |
| A. | the distribution law. |
| B. | followed from Margule's equation. |
| C. | a corollary of Henry's law. |
| D. | none of these. |
| Answer» B. followed from Margule's equation. | |
| 137. |
Consider the reaction, C + O₂ ↔ CO₂ ;ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO₂ → C + O₂ ? |
| A. | -94 kcal |
| B. | + 94 kcal |
| C. | > 94 kcal |
| D. | < -94 kcal |
| Answer» C. > 94 kcal | |
| 138. |
In the ammonia synthesis reaction, N₂ + 3H₂ ↔ 2NH₃ + 22.4 kcal, the formation of NH₃ will be favoured by |
| A. | high temperature. |
| B. | low pressure. |
| C. | low temperature only. |
| D. | both low temperature and high pressure. |
| Answer» E. | |
| 139. |
Pick out the wrong statement pertaining to the decomposition of PCl₅ represented by, PCl₅ ↔ PCl₃ + Cl₂Degree 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. | |
| 140. |
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 |
| Answer» E. | |
| 141. |
In the equation, PVⁿ = Constant, if the value of n = 0, then it represents a reversible __________ process. |
| A. | isobaric |
| B. | isothermal |
| C. | isentropic |
| D. | isometric |
| Answer» B. isothermal | |
| 142. |
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. | |
| 143. |
In the equation, PVⁿ = constant, if the value of n = 1, then it represents a reversible __________ process. |
| A. | isothermal |
| B. | isobaric |
| C. | polytropic |
| D. | adiabatic |
| Answer» B. isobaric | |
| 144. |
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. |
| Answer» D. none of these. | |
| 145. |
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. | |
| 146. |
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 | |
| 147. |
The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 148. |
"The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is |
| A. | the statement as per Gibbs-Helmholtz |
| B. | called Lewis-Randall rule |
| C. | Henry's law |
| D. | none of these |
| Answer» C. Henry's law | |
| 149. |
The ammonia synthesis reaction represented by N₂ + 3H₂ ↔ 2NH₃ ; ΔH = - 22.4 kcal, is |
| A. | endothermic |
| B. | exothermic |
| C. | isothermal |
| D. | adiabatic |
| Answer» C. isothermal | |
| 150. |
For the reversible exothermic reaction, N₂ + 3H₂ ↔ 2NH₃, increase of pressure would |
| A. | shift the equilibrium towards right. |
| B. | give higher yield of NH₃. |
| C. | both (b) and (c). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |