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MCQOPTIONS
This section includes 689 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. |
One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is |
| A. | 40732 |
| B. | 2676 |
| C. | 2263 |
| D. | 540 |
| Answer» D. 540 | |
| 102. |
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is |
| A. | 10.73 kJ |
| B. | 16.15 kJ |
| C. | 18.11 kJ |
| D. | 18.33 kJ |
| Answer» D. 18.33 kJ | |
| 103. |
The reaction A + B → C has been conducted in a reactor as shown below. The number of balances (material) that can be made around the reactor are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 104. |
Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution). |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | none of these |
| Answer» B. [B]. | |
| 105. |
In the reaction, represented by Na2CO3 + HC1 → NaHO3 + NaCl, the equivalent weight of Na2CO3 is |
| A. | 53 |
| B. | 5.3 |
| C. | 106 |
| D. | 10.6 |
| Answer» D. 10.6 | |
| 106. |
60 grams of FeS2, is burnt in air, how much sulfur dioxide will produce? |
| A. | 16 grams |
| B. | 32 grams |
| C. | 64 grams |
| D. | 128 gramsView answer |
| Answer» D. 128 gramsView answer | |
| 107. |
xFeS2 + yO2 -> zFe2O3 + wSO2, what is the value of x + y + z + w? |
| A. | 16 |
| B. | 21 |
| C. | 25 |
| D. | 32View answer |
| Answer» D. 32View answer | |
| 108. |
xKMnO4 + yFeS + zH2SO4 -> xMnSO4 + wFe2(SO4)3 + uK2SO4 + zH2O, what is the value of x + y + z + w + u? |
| A. | 60 |
| B. | 74 |
| C. | 85 |
| D. | 98View answer |
| Answer» C. 85 | |
| 109. |
20 grams of CaCO3 is heated, how much calcium oxide will produce? |
| A. | 5.6 grams |
| B. | 11.2 grams |
| C. | 22.4 grams |
| D. | 44.8 gramsView answer |
| Answer» C. 22.4 grams | |
| 110. |
wC3H7O4 + xO2 -> yCO2 + zH2O, what is the value of w + x + y + z? |
| A. | 21 |
| B. | 35 |
| C. | 41 |
| D. | 47View answer |
| Answer» D. 47View answer | |
| 111. |
wC3H6O3 + xO2 –> yCO2 + zH2O, what is the value of w + x + y + z? |
| A. | 3 |
| B. | 6 |
| C. | 10 |
| D. | 14View answer |
| Answer» E. | |
| 112. |
C5H12 + xO2 -> yCO2 + zH2O, what is the value of x + y*z? |
| A. | 24 |
| B. | 38 |
| C. | 46 |
| D. | 54View answer |
| Answer» C. 46 | |
| 113. |
C2H4 + xO2 -> 2CO2 + yH2O, what is the value of x + y? |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 8View answer |
| Answer» D. 8View answer | |
| 114. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to |
| A. | 225 |
| B. | 335 |
| C. | 525 |
| D. | 735 |
| Answer» E. | |
| 115. |
The molar composition of a gas is 10% H₂, 10% O₂, 30% CO₂ and balance H₂O. If 50% H₂O condenses, the final mole percent of H₂ in the gas on a dry basis will bebe |
| A. | 0% |
| B. | % |
| C. | 8.18% |
| D. | 0% |
| Answer» E. | |
| 116. |
At standard conditions, N₂ + 2O₂ ⇋ 2NO₂; ΔG° = 100 kJ/moleNO + ½O₂ ⇋ 2NO₂; ΔG° = -35 kJ/moleThe standard free energy of formation of NO in kJ/mole is |
| A. | 5 |
| B. | 0 |
| C. | 5 |
| D. | 70 |
| Answer» D. 70 | |
| 117. |
A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct? |
| A. | c > Xs |
| B. | c = Xs |
| C. | c < Xs |
| D. | c greater/less than Xs depending on the length of the cylinder |
| Answer» D. c greater/less than Xs depending on the length of the cylinder | |
| 118. |
Which of the following has the smallest least effect on the solubility of a solute into the solvent? |
| A. | ature of the solute |
| B. | ature of the solvent |
| C. | emperature |
| D. | ressure |
| Answer» E. | |
| 119. |
In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest? |
| A. | 0 c.c acid and 30 c.c base |
| B. | 0 c.c acid and 25 c.c base |
| C. | 5 c.c acid and 35 c.c base |
| D. | 5 c.c acid and 15 c.c base |
| Answer» B. 0 c.c acid and 25 c.c base | |
| 120. |
A car tyre of volume 0.057 m³ is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is |
| A. | 80 |
| B. | 30 |
| C. | 60 |
| D. | 80 |
| Answer» C. 60 | |
| 121. |
What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)? |
| A. | B₃ |
| B. | ₂B₃ |
| C. | ₂B |
| D. | B₂ |
| Answer» B. ₂B₃ | |
| 122. |
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is |
| A. | 3728 J |
| B. | 9206 J |
| C. | 576 J |
| D. | 2712 J |
| Answer» C. 576 J | |
| 123. |
Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74xl0-5m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. Its units are |
| A. | /s |
| B. | m/s |
| C. | ole/m².s.Pa |
| D. | mole/m².s.Pa |
| Answer» D. mole/m².s.Pa | |
| 124. |
In the reaction, Ca + 2H₂O = Ca(OH)₂ + H₂ ; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water? (atomic weight of calcium = 40) |
| A. | 480 |
| B. | 240 |
| C. | 120 |
| D. | 0.4 |
| Answer» B. 240 | |
| 125. |
The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.? |
| A. | 0.2 |
| B. | 0.1 |
| C. | 0.4 |
| D. | 0.6 |
| Answer» E. | |
| 126. |
The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the __________ law. |
| A. | aoult's |
| B. | enry's |
| C. | mgat's |
| D. | one of these |
| Answer» C. mgat's | |
| 127. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about |
| A. | 0.19 |
| B. | 0.33 |
| C. | 0.4 |
| D. | 0.67 |
| Answer» B. 0.33 | |
| 128. |
Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature? |
| A. | hlorine |
| B. | itrogen |
| C. | thane |
| D. | ll of the above |
| Answer» E. | |
| 129. |
Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74x10⁻⁵ m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10⁻³. The rate of evaporation of aniline is 2.97 x 10⁻⁴. Its units are |
| A. | mole/s |
| B. | mole/cm². s |
| C. | mole/m² . s |
| D. | kmole/m² . s |
| Answer» E. | |
| 130. |
The molar composition of a gas is 10% H₂, 10% O₂, 30% CO₂ and balance H₂O. If 50% H₂O condenses, the final mole percent of H₂ in the gas on a dry basis will be |
| A. | 10% |
| B. | 5% |
| C. | 18.18% |
| D. | 20% |
| Answer» E. | |
| 131. |
The value of (Cᵨ - Cᵥ)for a real gas obeying Vander Wall's equation is |
| A. | R |
| B. | > R |
| C. | < R |
| D. | 0.5 R |
| Answer» C. < R | |
| 132. |
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies |
| A. | 0 < Xw < 0.5 |
| B. | Xw = 0.5 |
| C. | 0.5 < Xw < 1.0 |
| D. | Xw = 1.0 |
| Answer» D. Xw = 1.0 | |
| 133. |
The unit of Cᵨ in S.I. units is |
| A. | W/m².°K |
| B. | J/kg.°K |
| C. | W/m.°K |
| D. | J/m³. °K |
| Answer» C. W/m.°K | |
| 134. |
At room temperature, the product [H⁺] [OH⁻] in a solution is 10⁻¹⁴ moles/litre. If, [OH⁻] = 10⁻⁶ moles/litre, then the pH of the solution will be |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 135. |
A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO₂, 0.05 gm mole of oxygen and 0.80 gm mole of N₂. What is its molecular weight ? |
| A. | 28.6 |
| B. | 30.0 |
| C. | 30.6 |
| D. | 32.6 |
| Answer» D. 32.6 | |
| 136. |
The combustion equations of carbon and carbon monoxide are as follows:C + O₂ = CO₂, ΔH = - 394 kJ/kg . mole CO + 1/2 O₂ = CO₂, ΔH = - 284.5 kJ/kg. mole. The heat of formation of CO is __________ kJ/kg. mole. |
| A. | -109.5 |
| B. | +109.5 |
| C. | +180 |
| D. | +100 |
| Answer» B. +109.5 | |
| 137. |
A car tyre of volume 0.057 m³ is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cᵥ for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is |
| A. | 380 |
| B. | 630 |
| C. | 760 |
| D. | 880 |
| Answer» C. 760 | |
| 138. |
The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol Xᴍ satisfies |
| A. | Xᴍ < 0.5 |
| B. | Xᴍ = 0.5 |
| C. | 0.5 < Xᴍ < 0.64 |
| D. | Xᴍ ≥ 0.64 |
| Answer» E. | |
| 139. |
Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity ? Vapour pressure of water at 20°C is 17.5 mm Hg. |
| A. | 80.38 |
| B. | 80 |
| C. | 79.62 |
| D. | 78.51 |
| Answer» D. 78.51 | |
| 140. |
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10⁻³ T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is |
| A. | 10.73 kJ |
| B. | 16.15 kJ |
| C. | 18.11 kJ |
| D. | 18.33 kJ |
| Answer» D. 18.33 kJ | |
| 141. |
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cᵨ = 29.1 J/mole.°C and, Cᵥ = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is |
| A. | 13728 J |
| B. | 19206 J |
| C. | 4576 J |
| D. | 12712 J |
| Answer» C. 4576 J | |
| 142. |
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xʙ and the vapour pressures of benzene and water at these conditions are pᵥᴮ and pᵥᵂ respectively. The partial pressure of benzene in air-vapour mixture is |
| A. | pᵥᴮ |
| B. | xʙ.pᵥᴮ |
| C. | (Patm - pᵥᵂ)xʙ |
| D. | xʙ.Patm |
| Answer» C. (Patm - pᵥᵂ)xʙ | |
| 143. |
In the reaction, represented by Na₂CO₃ + HCl → NaHO₃ + NaCl, the equivalent weight of Na₂CO₃ is |
| A. | 53 |
| B. | 5.3 |
| C. | 106 |
| D. | 10.6 |
| Answer» D. 10.6 | |
| 144. |
The heat evolved in the combustion of benzene is represented by the equation:C₆H₆ + 7.5 O₂ = 6CO₂ + 3H₂O, ΔH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C₆H₆ is burnt in an open container, will be __________ kJ/kgmole. |
| A. | +816.15 |
| B. | +1632.3 |
| C. | -1632.3 |
| D. | -2448.45 |
| Answer» D. -2448.45 | |
| 145. |
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°₂₉₈ = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to |
| A. | 1225 |
| B. | 1335 |
| C. | 1525 |
| D. | 1735 |
| Answer» E. | |
| 146. |
If 1.5 moles of oxygen combines with aluminium to form Al₂O₃, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm. |
| A. | 27 |
| B. | 54 |
| C. | 5.4 |
| D. | 2.7 |
| Answer» C. 5.4 | |
| 147. |
Cᵨ - Cᵥ, for an ideal gas is equal to |
| A. | R |
| B. | R/2 |
| C. | 2R |
| D. | 3R |
| Answer» B. R/2 | |
| 148. |
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ? |
| A. | ΔH = 1 (+ ve)and Δ V = -ve |
| B. | ΔH = 0 |
| C. | ΔV = 0 |
| D. | both (b) and (c) |
| Answer» E. | |
| 149. |
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 150. |
The hydroxyl ion (OH⁻) concentration in a solution having pH value 3 will be |
| A. | 10⁻¹¹ |
| B. | 10⁻¹⁰ |
| C. | 10⁻³ |
| D. | 10⁻⁴ |
| Answer» B. 10⁻¹⁰ | |