Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature (A) Rate of reaction is very low (B) Very high pressure is required resulting in costly pressure vessel (C) Space velocity of gas is very low resulting in decreased conversion (D) None of these

Though kinetics of ammonia synthesis dictates the use of low
temperature for high equilibrium conversion, yet it is kept moderately high
(550°C), because at low temperature
(A) Rate of reaction is very low
(B) Very high pressure is required resulting in costly pressure vessel
(C) Space velocity of gas is very low resulting in decreased conversion
(D) None of these
by

1 Answer

Answer :

(A) Rate of reaction is very low
by

Related questions

In ammonia synthesis (N2 + 3H2 = 2NH3 ), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should becarried out at(A) Low pressure(B) High pressure(C) Very high temperature(D) Atmospheric pressure; as the pressure has no effect on conversion

Description : In ammonia synthesis (N2 + 3H2 = 2NH3 ), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should becarried out at (A) Low pressure (B) High pressure (C) Very high temperature (D) Atmospheric pressure; as the pressure has no effect on conversion

Last Answer : (B) High pressure

Pick out the wrong statement. (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition (B) Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction

Description : Pick out the wrong statement. (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition (B) Alumina is added as a promoter to ... Arrhenius plot (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction

Last Answer : (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot

Temperature and pressure in ammonia converter is (A) 200 atm, 1000°C (B) 450 atm, 200°C (C) 450 atm, 550°C (D) 450 atm, 1000°C

Description : Temperature and pressure in ammonia converter is (A) 200 atm, 1000°C (B) 450 atm, 200°C (C) 450 atm, 550°C (D) 450 atm, 1000°C

Last Answer : (C) 450 atm, 550°C

Liquid ammonia is not used as such a fertiliser in tropical countries like India, because (A) Its N2 content is very low (B) It is very costly (C) It will evaporate on spraying (D) It is not available

Description : Liquid ammonia is not used as such a fertiliser in tropical countries like India, because (A) Its N2 content is very low (B) It is very costly (C) It will evaporate on spraying (D) It is not available

Last Answer : (C) It will evaporate on spraying

The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the (A) Temperature of the system (B) Presence or absence of inerts (C) Pressure of the system (D) Kinetics of the reaction

Description : The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the (A) Temperature of the system (B) Presence or absence of inerts (C) Pressure of the system (D) Kinetics of the reaction

Last Answer : (C) Pressure of the system

Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇌ 2NH3 . (A) Increases (B) Decreases (C) Remains unchanged (D) Unpredictable from the data

Description : Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇌ 2NH3 . (A) Increases (B) Decreases (C) Remains unchanged (D) Unpredictable from the data

Last Answer : (A) Increases

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

Description : 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

Last Answer : (D) Both low temperature and high pressure

A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes. (A) 4 (B) 8 (C) 12 (D) 16

Description : A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes. (A) 4 (B) 8 (C) 12 (D) 16

Last Answer : (D) 16

Double pipe heat exchangers are used (A) When heat transfer area required is very high (B) When heat transfer area required is very low, i.e. (100-200 ft 2 ). (C) Because it occupies less floor area (D) Because it is less costly

Description : Double pipe heat exchangers are used (A) When heat transfer area required is very high (B) When heat transfer area required is very low, i.e. (100-200 ft 2 ). (C) Because it occupies less floor area (D) Because it is less costly

Last Answer : (B) When heat transfer area required is very low, i.e. (100-200 ft 2 )

Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it (A) Has a pungent smell (B) Vaporises at normal temperature (C) Is toxic and highly corrosive (D) Is in short supply

Description : Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it (A) Has a pungent smell (B) Vaporises at normal temperature (C) Is toxic and highly corrosive (D) Is in short supply

Last Answer : (B) Vaporises at normal temperature

In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by (A) Increasing the oxygen concentration (B) Putting more quantity of V2O5 catalyst in the converter (C) Removing some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Description : In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to ... some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Last Answer : (C) Removing some quantity of SO3 during intermediate stage

Pick out the wrong statement. (A) The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction (B) With increase in temperature, the equilibrium constant increases for an exothermic reaction (C) The equilibrium constant of a reaction depends upon temperature only (D) The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

Description : Pick out the wrong statement. (A) The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction (B) With ... phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

Last Answer : (B) With increase in temperature, the equilibrium constant increases for an exothermic reaction

Kopper-Totzek coal gasifier (A) Can give ammonia synthesis gas (H2 + N2 ) (B) Is a moving bed reactor (C) Cannot use coking coal (D) Operate at very high pressure

Description : Kopper-Totzek coal gasifier (A) Can give ammonia synthesis gas (H2 + N2 ) (B) Is a moving bed reactor (C) Cannot use coking coal (D) Operate at very high pressure

Last Answer : (A) Can give ammonia synthesis gas (H2 + N2 )

Kopper-Totzek coal gasifier (A) Can give ammonia synthesis gas (H2 + N2 ) (B) Is a moving bed reactor(C) Cannot use coking coal(D) Operate at very high pressure

Description : Kopper-Totzek coal gasifier (A) Can give ammonia synthesis gas (H2 + N2 ) (B) Is a moving bed reactor (C) Cannot use coking coal (D) Operate at very high pressure

Last Answer : (A) Can give ammonia synthesis gas (H2 + N2 )

A high space velocity means that a given (A) Reaction can be accomplished with small reactor (B) Conversion can be obtained with a high feed rate (C) Both (A) and (B) (D) None of these

Description : A high space velocity means that a given (A) Reaction can be accomplished with small reactor (B) Conversion can be obtained with a high feed rate (C) Both (A) and (B) (D) None of these

Last Answer : (C) Both (A) and (B)

In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3 ), the value of the equilibrium constant depends on the (A) Total pressure of the system (B) Volume of the reactor (C) Temperature (D) Initial concentration of N2 and H2

Description : In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3 ), the value of the equilibrium constant depends on the (A) Total pressure of the system (B) Volume of the reactor (C) Temperature (D) Initial concentration of N2 and H2

Last Answer : (C) Temperature

Equilibrium of a chemical reaction as viewed by kinetics is a __________ state. (A) Dynamic steady (B) Static steady (C) Dynamic unsteady (D) None of these

Description : Equilibrium of a chemical reaction as viewed by kinetics is a __________ state. (A) Dynamic steady (B) Static steady (C) Dynamic unsteady (D) None of these

Last Answer : (A) Dynamic steady

Operating temperature and pressure in catalytic reforming is about (A) 1-5 Kgf/cm2 & 200°C (B) 15-45 Kgf/cm2 & 450-550°C (C) 50 - 75 kgf/cm2 & 600 - 800°C (D) 5-10 kgf/cm2 & 150 - 250°C

Description : Operating temperature and pressure in catalytic reforming is about (A) 1-5 Kgf/cm2 & 200°C (B) 15-45 Kgf/cm2 & 450-550°C (C) 50 - 75 kgf/cm2 & 600 - 800°C (D) 5-10 kgf/cm2 & 150 - 250°C

Last Answer : (B) 15-45 Kgf/cm2 & 450-550°C

Higher free energy of activation of a chemical reaction (at a given temperature) implies (A) Slower rate of reaction (B) Higher rate of reaction (C) Higher equilibrium conversion (D) Both (B) and (C)

Description : Higher free energy of activation of a chemical reaction (at a given temperature) implies (A) Slower rate of reaction (B) Higher rate of reaction (C) Higher equilibrium conversion (D) Both (B) and (C)

Last Answer : (A) Slower rate of reaction

Space velocity (A) Describes the extensive operating characteristics of a tubular flow reactor (B) Is the maximum feed rate per unit volume of reactor for a given conversion (C) Is a measure of the ease of the reaction (D) All (A), (B) and (C)

Description : Space velocity (A) Describes the extensive operating characteristics of a tubular flow reactor (B) Is the maximum feed rate per unit volume of reactor for a given conversion (C) Is a measure of the ease of the reaction (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

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

Description : 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

Last Answer : (D) None of these

Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation (A) Pressure falls below the vapour pressure (B) Pressure becomes very high (C) Temperature becomes low (D) All 'a', 'b' & 'c'

Description : Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation (A) Pressure falls below the vapour pressure (B) Pressure becomes very high (C) Temperature becomes low (D) All 'a', 'b' & 'c'

Last Answer : (D) All 'a', 'b' & 'c'

According to the 'law of mass action', the rate of reaction is directlyproportional to the (A) Equilibrium constant (B) Volume of the reaction vessel (C) Nature of the reactants (D) Molar concentration of the reactants

Description : According to the 'law of mass action', the rate of reaction is directlyproportional to the (A) Equilibrium constant (B) Volume of the reaction vessel (C) Nature of the reactants (D) Molar concentration of the reactants

Last Answer : (D) Molar concentration of the reactants

Multistage operation (as in the case of catalytic oxidation of SO2 ) is not carried out for NH3 synthesis, because of (A) Comparatively higher pressure drop (B) High cost of the high pressure vessel used for the reactor (C) Higher pumping cost (D) Chances of entrainment and disturbance of catalyst bed

Description : Multistage operation (as in the case of catalytic oxidation of SO2 ) is not carried out for NH3 synthesis, because of (A) Comparatively higher pressure drop (B) High cost of the high pressure ... for the reactor (C) Higher pumping cost (D) Chances of entrainment and disturbance of catalyst bed

Last Answer : (B) High cost of the high pressure vessel used for the reactor

Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor? (A) Temperature should be high in the beginning and decreased towards the end of the reaction (B) Very low temperature should be used throughout the reaction (C) Very high temperature should be used throughout the reaction (D) None of these

Description : Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor? (A) Temperature should be high in the beginning and decreased towards ... reaction (C) Very high temperature should be used throughout the reaction (D) None of these

Last Answer : (A) Temperature should be high in the beginning and decreased towards the end of the reaction

Ceramic recuperators compared to metallic recuperators for the same duty (A) Are lighter (B) Occupy more space (C) Are less costly (D) Have higher pressure differential between flue gas & air side

Description : Ceramic recuperators compared to metallic recuperators for the same duty (A) Are lighter (B) Occupy more space (C) Are less costly (D) Have higher pressure differential between flue gas & air side

Last Answer : (B) Occupy more space

Conversion achieved in HNO3 synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by (A) Decreasing the pressure (B) Decreasing the temperature (C) Increasing the temperature (D) None of these

Description : Conversion achieved in HNO3 synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by (A) Decreasing the pressure (B) Decreasing the temperature (C) Increasing the temperature (D) None of these

Last Answer : (C) Increasing the temperature

A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is (A) 0.33 (B) 0.5 (C) 1 (D) Data insufficient, can't be predicted

Description : A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is (A) 0.33 (B) 0.5 (C) 1 (D) Data insufficient, can't be predicted

Last Answer : (C) 1

Lead alone is not used in storing equipment, because it (A) Is very costly (B) Corrodes easily (C) Is having low creep strength (D) None of these

Description : Lead alone is not used in storing equipment, because it (A) Is very costly (B) Corrodes easily (C) Is having low creep strength (D) None of these

Last Answer : (C) Is having low creep strength

Fauser Montecatini converter is used for (A) Ammonia synthesis (e.g. at FCI Sindri, India) (B) Methanation of CO and CO2 (C) Shift conversion (i.e. CO to CO2 ) (D) None of these

Description : Fauser Montecatini converter is used for (A) Ammonia synthesis (e.g. at FCI Sindri, India) (B) Methanation of CO and CO2 (C) Shift conversion (i.e. CO to CO2 ) (D) None of these

Last Answer : (A) Ammonia synthesis (e.g. at FCI Sindri, India)

Copper, even though costly, finds use in the windings of electrical machines because

Last Answer : Copper, even though costly, finds use in the windings of electrical machines because copper points offer low contact resistance , copper can be easily soldered and welded, copper windings are less bulky and the machines become compact.

Which of the following situations can be approximated to a steady state heat transfer system? (A) A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at 35°C (B) 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C (C) Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C (D) A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C

Description : Which of the following situations can be approximated to a steady state heat transfer system? (A) A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at ... flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C

Last Answer : (B) 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C

Priming in a distillation column (A) Results from very low gas velocity (B) Is desirable from point efficiency consideration (C) Is characterised by the presence of foam throughout the space between trays (D) Reduces the overall pressure drop

Description : Priming in a distillation column (A) Results from very low gas velocity (B) Is desirable from point efficiency consideration (C) Is characterised by the presence of foam throughout the space between trays (D) Reduces the overall pressure drop

Last Answer : (C) Is characterised by the presence of foam throughout the space between trays

At equilibrium the concentration of water in vapour phase (C* ) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is (A) 0.0 (B) 0.2 (C) 0.4 (D) 1.0

Description : At equilibrium the concentration of water in vapour phase (C* ) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room ... which the temperature is maintained constant) is (A) 0.0 (B) 0.2 (C) 0.4 (D) 1.0

Last Answer : (C) 0.4

Pick out the wrong statement. (A) A particular chemical reaction is more temperature sensitive at low temperatures (B) A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically irreversible in nature (C) The intercept of the Arrhenius plot is called the 'activation energy' (D) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Description : Pick out the wrong statement. (A) A particular chemical reaction is more temperature sensitive at low temperatures (B) A very high value of equilibrium constant, K (K >> 1) indicates that the ... ) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Last Answer : (C) The intercept of the Arrhenius plot is called the 'activation energy

The most serious disadvantage of an orificemeter is that (A) It is not very accurate (B) It is very costly (C) Most of the pressure drop is not recoverable (D) It is not suitable for measuring gas flow

Description : The most serious disadvantage of an orificemeter is that (A) It is not very accurate (B) It is very costly (C) Most of the pressure drop is not recoverable (D) It is not suitable for measuring gas flow

Last Answer : (C) Most of the pressure drop is not recoverable

A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C. (A) 370 (B) 340 (C) 320 (D) 300

Description : A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C. (A) 370 (B) 340 (C) 320 (D) 300

Last Answer : (A) 370

Limiting reactant in a chemical reaction decides the (A) Rate constant (B) Conversion (C) Reaction speed (D) Equilibrium constant

Description : Limiting reactant in a chemical reaction decides the (A) Rate constant (B) Conversion (C) Reaction speed (D) Equilibrium constant

Last Answer : (B) Conversion

Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the (A) High evaporation losses of water (B) High pressure drop of the gas (C) Difficulty in its fabrication (D) None of these

Description : Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the (A) High evaporation losses of water (B) High pressure drop of the gas (C) Difficulty in its fabrication (D) None of these

Last Answer : (B) High pressure drop of the gas

In severe acidosis, the output of urea is (A) Decreased (B) Slightly increased (C) Highly increased (D) Moderately increased

Description : In severe acidosis, the output of urea is (A) Decreased (B) Slightly increased (C) Highly increased (D) Moderately increased

Last Answer : Answer : A

Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done. (A) Increased biuret formation (B) High corrosion rate (C) Increased cost of equipment (D) All (A), (B) & (C)

Description : Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done. (A) Increased biuret formation (B) High corrosion rate (C) Increased cost of equipment (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Low grade coal is __________ to produce ammonia synthesis gas. (A) Hydrogenated (B) Liquefied (C) Gasified (D) Dehydrogenated

Description : Low grade coal is __________ to produce ammonia synthesis gas. (A) Hydrogenated (B) Liquefied (C) Gasified (D) Dehydrogenated

Last Answer : (C) Gasified

With increase in temperature, the equilibrium __________ rises in case of endothermic reaction. (A) Constant (B) Conversion (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : With increase in temperature, the equilibrium __________ rises in case of endothermic reaction. (A) Constant (B) Conversion (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (B) Conversion

With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction (A) Decreases (B) Increases (C) Remain unaffected (D) Increases linearly with temperature

Description : With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction (A) Decreases (B) Increases (C) Remain unaffected (D) Increases linearly with temperature

Last Answer : (A) Decreases

Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature. (A) Highest possible (B) Lowest possible (C) Intermediate (D) Room

Description : Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature. (A) Highest possible (B) Lowest possible (C) Intermediate (D) Room

Last Answer : (A) Highest possible

With increase in temperature, the equilibrium conversion of a reversibleexothermic reaction(A) Decreases(B) Increases(C) Remain unaffected(D) Decreases linearly with temperature

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A sigmoidal plot of substrate concentration ([S]) verses reaction velocity (V) may indicate (A) Michaelis-Menten kinetics (B) Co-operative binding (C) Competitive inhibition (D) Non-competitive inhibition

Description : A sigmoidal plot of substrate concentration ([S]) verses reaction velocity (V) may indicate (A) Michaelis-Menten kinetics (B) Co-operative binding (C) Competitive inhibition (D) Non-competitive inhibition

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Last Answer : (C) 0.60

Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm). (A) Highly (B) Moderately (C) Extremely (D) Very extremely

Description : Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm). (A) Highly (B) Moderately (C) Extremely (D) Very extremely

Last Answer : (B) Moderately