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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 2001. |
What is the extent of the reaction?(a) 0(b) 1(c) 2(d) 3 |
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Answer» Correct choice is (b) 1 The best explanation: Extent of the reaction = (Initial moles – Final moles) / Stoichiometric coefficient. |
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| 2002. |
What is the average molecular weight of a gas containing 20% N2 (molecular wt. = 28) and 80% SO2 (molecular wt. = 64)?(a) 28.4(b) 56.8(c) 24.4(d) 48.8 |
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Answer» The correct choice is (b) 56.8 To explain: Take 1 gm mole of the Gas and then average molecular weight = 0.20×28+0.80×64. |
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| 2003. |
Find the correct statement for ppm(a) For solids and liquids, it is mole ratio(b) For gases, it is mole ratio(c) It is mole ration for every phase of matter(d) It is mass ratio for every phase of matter |
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Answer» The correct option is (b) For gases, it is mole ratio For explanation: For gases, it is mole ratio and for liquids and solids, it is mass ratio. |
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| 2004. |
1 atm pressure is equal to(a) 101.3 kPa(b) 760 mm of Hg(c) 14.69 psi(d) All of the mentioned |
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Answer» The correct choice is (d) All of the mentioned Explanation: 1 atm = 101.3 kPa = 760 mm of Hg = 14.69 psi. |
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| 2005. |
________ flow rate of a process stream is the mass transported through a pipe per unit time.(a) Mass(b) Mole(c) Volume(d) None of the mentioned |
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Answer» Right option is (a) Mass The best I can explain: Mass flow rate of a process stream is the mass transported through a pipe per unit time. |
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| 2006. |
The sum of the partial pressures of the components of a gas mixture`s is(a) Total absolute pressure(b) Total pressure exerted by a component of a gas(c) Total pressure of a gas mixture(d) None of the mentioned |
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Answer» Right answer is (c) Total pressure of a gas mixture Best explanation: The sum of the partial pressures of the components of a gas mixture`s is Total pressure of a gas mixture. |
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| 2007. |
Most heat energy is required in the following process?(a) Sublimation(b) Evaporation(c) Condensation(d) None of the mentioned |
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Answer» Right option is (a) Sublimation To elaborate: Sublimation needs more energy than evaporation and condensation. |
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| 2008. |
A bypass stream can be used to control the composition of a final exit stream. The statement is(a) True(b) False(c) Always False(d) None of the mentioned |
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Answer» Right option is (a) True Explanation: A bypass stream can be used to control the composition of a final exit stream from a unit by mixing the bypass stream and the unit exit stream in suitable proportion to obtain the desired final composition. |
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| 2009. |
How many moles of NaCl can be produced with 73 gms of HCl? (Consider NaOH in excess)(a) 1(b) 2(c) 3(d) None of the mentioned |
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Answer» Correct option is (b) 2 The explanation is: 1 mole of NaCl is equivalent to 36.5 gms of HCl. |
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| 2010. |
What is the composition of the O2 gas on an SO2-free basis?(a) 0.78 and 0.22(b) 0.22 and 0.78(c) 0.70 and 0.25(d) 0.25 and 0.78 |
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Answer» The correct option is (a) 0.78 and 0.22 To elaborate: First take a basis of 100 mole and then we get the moles of each gas. Next step is to eliminate 5 moles of SO2 and then calculate the composition of the gas. |
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| 2011. |
What is the mole fraction of SO2?(a) 0.2(b) 0.4(c) 0.6(d) 0.8 |
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Answer» The correct choice is (a) 0.2 Explanation: Mole fraction = Moles of the component / Total moles. |
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| 2012. |
If Cl2 is present in excess and the amount of CH4 is doubled, number of moles of HCl will be ____________(a) Doubled(b) Half(c) Four times(d) None of the mentioned |
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Answer» The correct choice is (a) Doubled Explanation: 1 mole of Cl2 is equivalent to 1 mole of CH4. |
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| 2013. |
What is the mole percent of N2 in the product?(a) 10(b) 16(c) 24(d) 40 |
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Answer» Right choice is (a) 10 The best explanation: N2 is not involved in the reaction, Moles of N2 = 10 moles. |
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| 2014. |
For producing 1 mole of HCl, how many moles of Cl2 are required? (Consider CH4 in excess)(a) 1(b) 4(c) 5(d) 6.5 |
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Answer» The correct choice is (a) 1 For explanation: 1 mole of Cl2 is equivalent to 1 mole of HCl. |
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| 2015. |
What is the weight fraction of N2 in a gas when it is liquefied? The gas contains 400 ppm of N2 in CO2.(a) 2.54×10-4(b) 3.54×10-4(c) 4.54×10-4(d) 5.54×10-4 |
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Answer» The correct answer is (a) 2.54×10-4 To explain: Basis: 106 mole gas. |
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| 2016. |
In barometer, the given space labelled as A, above the mercury is(a) Vacuum(b) Filled with Air(c) Filled with water(d) Filled with Gas |
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Answer» Right choice is (a) Vacuum The explanation is: To correctly measure the atmospheric pressure, the space above the mercury level in a barometer is essentially vacuum. Otherwise, the fluid in the space will exert a pressure on the mercury surface. |
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| 2017. |
What is weight percentage of N2?(a) 22.58(b) 25.86(c) 42.56(d) 54.87 |
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Answer» Correct choice is (a) 22.58 To explain I would say: Weight percentage = mass of the component / Total mass. |
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| 2018. |
What is the final amount of fluid in the vessel if the system is in steady state?(a) Same as the initial amount(b) Twice the initial amount(c) Zero(d) None of the mentioned |
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Answer» Right option is (a) Same as the initial amount To explain I would say: Since in steady-state the rate of flow in is equal to the rate of flow out, so final amount of fluid in the vessel is same as the initial amount. |
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| 2019. |
For the given process, how many recycle streams are there(a) 1(b) 2(c) 3(d) 4 |
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Answer» Correct option is (a) 1 Explanation: Material that leaves a process unit that is the downstream and is returned to the same unit is called recycle. |
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| 2020. |
Pressure measured above atmospheric pressure is called(a) Absolute pressure(b) Gauge pressure(c) Static pressure(d) None of the mentioned |
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Answer» Right option is (b) Gauge pressure The best I can explain: Pressure measured above atmospheric pressure is called absolute pressure. |
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| 2021. |
An unsteady state system, the flow in rate of A is 5 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 5 seconds?(a) 1 mole/s(b) 2 mole/s(c) 3 mole/s(d) 5 mole/s |
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Answer» The correct choice is (c) 3 mole/s The explanation: Flow rate of B = 5 – 10/5 = 3 mole/s. |
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| 2022. |
An unsteady state system, the flow in the rate of A is 12 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 3 seconds?(a) 4 mole/s(b) 6 mole/s(c) 8 mole/s(d) 9 mole/s |
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Answer» Correct choice is (b) 6 mole/s To explain: Flow rate of B = 12 – 18/3 = 6 mole/s. |
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| 2023. |
An unsteady state system, the flow in the rate of A is 6 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 9 seconds?(a) 1 mole/s(b) 2 mole/s(c) 3 mole/s(d) 4 mole/s |
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Answer» Correct choice is (d) 4 mole/s Best explanation: Flow rate of B = 6 – 18/9 = 4 mole/s. |
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| 2024. |
An unsteady state system, the flow in rate of A is 8 mole/s, what is the flow out rate of B if the accumulation was 6 mole in 2 seconds?(a) 1 mole/s(b) 2 mole/s(c) 3 mole/s(d) 5 mole/s |
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Answer» Right answer is (d) 5 mole/s The explanation: Flow rate of B = 8 – 6/2 = 5 mole/s. |
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| 2025. |
An unsteady state system, the flow in rate of A is 10 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 2 seconds?(a) 5 mole/s(b) 10 mole/s(c) 15 mole/s(d) 20 mole/s |
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Answer» Correct answer is (a) 5 mole/s Explanation: Flow rate of B = 10 – 10/2 = 5 mole/s. |
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| 2026. |
What is the composition of SO2 in waste stream?(a) 0.8175(b) 0.8165(c) 0.8145(d) 0.8125 |
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Answer» Correct answer is (d) 0.8125 To explain I would say: Mole balances for both the gases. |
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| 2027. |
By taking 360 gms of Glucose how many gms of CO2 can be produced?(a) 228(b) 328(c) 428(d) 528 |
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Answer» The correct choice is (d) 528 Easiest explanation: 1 mole of Glucose = 6 moles of CO2. |
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| 2028. |
How many gms of CH3Cl can be produced with 16 gms of CH4? (Consider Cl2 in excess)(a) 50.5(b) 58.5(c) 60.5(d) None of the mentioned |
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Answer» Right option is (a) 50.5 Easiest explanation: 50.5 gms of CH3Cl is equivalent to 16 gms of CH4. |
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| 2029. |
What is the percentage of N2 in the product?(a) 8(b) 18(c) 34(d) 46 |
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Answer» Right option is (a) 8 To explain I would say: Assume that 100 moles of feed is present in the reactor and do the material balance for each, Percentage of N2 = 8%. |
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| 2030. |
How many moles of HCl can be produced with 71 gms of Cl2? (Consider CH4 in excess)(a) 1(b) 2(c) 3(d) None of the mentioned |
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Answer» Correct choice is (b) 2 For explanation I would say: 1 mole of HCl is equivalent to 35.5 gms of Cl2. |
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| 2031. |
An unsteady-state system, with 6 liters as initial amount of water in the vessel, water flow in rate is 2 liters/ s and flow out rate is 4 liters/s, what will be the amount of water in the vessel after 1 second?(a) 2 liters(b) 4 liters(c) 6 liters(d) 8 liters |
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Answer» Correct choice is (b) 4 liters For explanation: Total amount of water reduced from the vessel in 1 second = (4 – 2)*1 = 2 liters, => Final amount of water = 6 – 2 = 4 liters. |
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| 2032. |
In the sketch, the height h is equivalent to 150 kPa and the barometer reading is 100 kPa. What is pressure inside the tank that is attached to the manometer?(a) 250 kPa(b) 150 kPa(c) 100 kPa(d) 50 kPa |
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Answer» Right choice is (a) 250 kPa For explanation I would say: Pressure inside the tank = atmospheric pressure + pressure due to liquid height h. |
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| 2033. |
The feed stream that enters a reactor, usually used in a process with a reactor and recycle, is(a) Process feed(b) Overall process(c) Overall product(d) None of the mentioned |
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Answer» Right option is (a) Process feed Explanation: The feed stream that enters a reactor, usually used in a process with a reactor and recycle, is process feed. |
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| 2034. |
Material that leaves a process unit that is the downstream and is returned to the same unit is called(a) Recycle(b) Purge(c) Bypass(d) None of the mentioned |
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Answer» Correct option is (a) Recycle Explanation: Material that leaves a process unit that is the downstream and is returned to the same unit is called Recycle. |
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| 2035. |
An unsteady-state system, with 10 liters as initial amount of water in the vessel, water flow in rate is 8 liters/ s and flow out rate is 5 liters/s, what will be the amount of water in the vessel after 10 seconds?(a) 10 liters(b) 20 liters(c) 30 liters(d) 40 liters |
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Answer» The correct answer is (d) 40 liters The best I can explain: Amount of water added to the vessel in 10 seconds = (8 – 5)*10 = 30 liters, => Final amount of water = 10 + 30 = 40 liters. |
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| 2036. |
The rate flow in and flow out in an unsteady state process are now increased by 10 Kg/s, which will be the change in accumulation?(a) 0(b) 5 Kg/s(c) 10 Kg/s(d) 20 Kg/s |
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Answer» Right option is (a) 0 Easy explanation: Initial accumulation = rate of flow out – rate of flow in, => Final accumulation = (rate of flow out + 10) – (rate of flow in + 10) = Initial accumulation, => Change in accumulation = 0. |
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| 2037. |
What is amount of CH3OH in the waste?(a) 150 Kg(b) 250 Kg(c) 450 Kg(d) 750 Kg |
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Answer» Correct option is (a) 150 Kg To explain: Waste = Product – Feed. |
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| 2038. |
How many grams of C2H6 are required to produce 88 grams of CO2 when it is burned in the excess of oxygen?(a) 15(b) 30(c) 45(d) 60 |
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Answer» Correct choice is (b) 30 The best I can explain: 1 gram mole of C2H6 = 2 gram moles of CO2. |
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| 2039. |
How many moles of CH3Cl can be produced with 71 gms of Cl2? (Consider CH4 in excess)(a) 1(b) 2(c) 3(d) None of the mentioned |
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Answer» Correct option is (b) 2 Best explanation: 1 mole of CH3Cl is equivalent to 35.5 gms of Cl2. |
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| 2040. |
A fluid enters a vessel at the rate of 10 liters/s, and leaves in two pathways one with 7 liters/s and other with 3 liters/s, then what type of flow it is?(a) Steady-state(b) Unsteady-state(c) Cannot say(d) None of the mentioned |
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Answer» Correct answer is (a) Steady-state Explanation: Since the flow in rate and flow out rate of the fluid are equal, the system is in steady-state. |
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| 2041. |
The conversion of a reactant based on the amount of material that enters and leaves a reactor is(a) Once through fraction conversion(b) Overall fraction conversion(c) Percentage conversion(d) None of the mentioned |
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Answer» Correct choice is (a) Once through fraction conversion Easy explanation: The conversion of a reactant based on the amount of material that enters and leaves a reactors is called once through fraction conversion. |
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| 2042. |
How much water is there in the tank after fermentation?(a) 94.45 kg(b) 5100 kg(c) 5194.45 kg(d) None of the mentioned |
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Answer» Right option is (c) 5194.45 kg Easiest explanation: Species mole balance for each. |
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| 2043. |
A fluid enters a vessel at the rate of 10 liters/s, and leaves in two pathways one with 5 liters/s and other with 3 liters/s, then what type of flow it is?(a) Steady-state(b) Unsteady-state(c) Cannot say(d) None of the mentioned |
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Answer» Correct option is (b) Unsteady-state To elaborate: Since the flow in rate and flow out rate of the fluid are unequal, the system is in unsteady-state. |
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| 2044. |
A ____________ is one in which material enters and leaves the system without interruption.(a) Continuous process(b) Batch process(c) Semi-batch process(d) None of the mentioned |
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Answer» The correct option is (a) Continuous process Easiest explanation: A continuous is one in which material enters and leaves the system without interruption. |
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| 2045. |
If A = 100 moles, what are the number of moles of C?(a) 151.4(b) 161.4(c) 171.4(d) 181.6 |
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Answer» Correct option is (c) 171.4 To elaborate: Σxi = 1. |
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| 2046. |
Which one is the limiting reactant?(a) Cl2(b) C4H8(c) C4H7Cl(d) None of the mentioned |
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Answer» The correct option is (a) Cl2 To explain I would say: Cl2 has lower extent of reaction. |
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| 2047. |
Which is the limiting reactant in the reaction?(a) C5H12(b) O2(c) CO2(d) H2O |
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Answer» Right option is (b) O2 To elaborate: O2 is the limiting reactant as 1 mole of C5H12 = 8 moles of CO2. |
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| 2048. |
If the required amount of water is 72 kg then how much C6H14 should be burned per hour?(a) 49.14(b) 39.14(c) 39.14(d) 29.14 |
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Answer» Right answer is (a) 49.14 Easiest explanation: 1 mole of C6H14 = 7 moles of H2O. |
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| 2049. |
_______________ is the fraction of the limiting reactant in the feed that is converted into products.(a) Conversion(b) Production(c) Extent of reaction(d) None of the mentioned |
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Answer» Correct option is (a) Conversion Explanation: Conversion is the fraction of the limiting reactant in the feed that is converted into products. |
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| 2050. |
What is the value of d?(a) 1(b) 4(c) 5(d) 6.5 |
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Answer» Right answer is (c) 5 For explanation I would say: Carbon and Oxygen on both the sides. |
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