Why The actual yield of a chemical reaction is generally?

Why The actual yield of a chemical reaction is generally?
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Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to (A) Increase the yield of light distillates (B) Suppress coke formation (C) Enhance the octane number of gasoline (D) Reduce gum content in gasoline

Description : Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to (A) Increase the yield of ... coke formation (C) Enhance the octane number of gasoline (D) Reduce gum content in gasoline

Last Answer : (B) Suppress coke formation

How do you calculate the percentage yield of a chemical reaction?

Description : How do you calculate the percentage yield of a chemical reaction?

Last Answer : Need answer

Pick out the wrong statement (A) Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance (B) In case of gas absorption, HETP is equal to HTU, when both the operating line & the equilibrium lines are parallel (C) Hatta number is important in case of gas absorption with chemical reaction (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process

Description : Pick out the wrong statement (A) Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance (B) In case of gas absorption, HETP is ... reaction (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process

Last Answer : (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process

While determining the yield of open wells by the pumping test (A) Velocity of recharging water, increases with depression head (B) Depression head resulting at critical velocity, is called critical depression head (C) Working head is generally limited to (D) Maximum safe yield of an open well, is expected at critical depression head

Description : While determining the yield of open wells by the pumping test  (A) Velocity of recharging water, increases with depression head  (B) Depression head resulting at critical velocity, is called critical ... (D) Maximum safe yield of an open well, is expected at critical depression head 

Last Answer : (D) Maximum safe yield of an open well, is expected at critical depression head 

Specific capacity or yield of wells, is generally expressed, as (A) m 3 per sec (B) m 3 /hour (C) m 3 /hour/m2 (D) m 3 /hour/m2 /m

Description : Specific capacity or yield of wells, is generally expressed, as  (A) m 3  per sec  (B) m 3 /hour  (C) m 3 /hour/m2 (D) m 3 /hour/m2 /m 

Last Answer : (D) m 3 /hour/m2 /m 

Select incorrect statement from the following. In the Virtual work method, it is generally assumed that [ A ] Elastic deformations in the slab are negligible [ B ] Plastic deformations in the slab are negligible [ C ] Plastic deformations takes place at the yield lines [ D ] Both (a) and (b)

Description : Select incorrect statement from the following. In the Virtual work method, it is generally assumed that [ A ] Elastic deformations in the slab are negligible [ B ] Plastic deformations in the slab are negligible [ C ] Plastic deformations takes place at the yield lines [ D ] Both (a) and (b)

Last Answer : [ B ] Plastic deformations in the slab are negligible

Which of the following is not a characteristic feature of yield lines? [ A ] Yield lines end at a slab boundary [ B ] Yield lines are of parabolical shape [ C ] Axes of rotation generally lie along the lines of supports [ D ] None of the above.

Description : Which of the following is not a characteristic feature of yield lines? [ A ] Yield lines end at a slab boundary [ B ] Yield lines are of parabolical shape [ C ] Axes of rotation generally lie along the lines of supports [ D ] None of the above.

Last Answer : [ B ] Yield lines are of parabolical shape

Audit programs generally include procedures to test actual transactions and resulting balances. These procedures are primarily designed to a. Detect irregularities that result in misstated financial statements. b. Test the adequacy of internal control. c. Gather corroborative evidence. d. Obtain information of informative disclosures

Description : Audit programs generally include procedures to test actual transactions and resulting balances. These procedures are primarily designed to a. Detect irregularities that result in misstated financial ... control. c. Gather corroborative evidence. d. Obtain information of informative disclosures

Last Answer : Gather corroborative evidence

Audit programs are modified to suit the circumstances on particular engagements. A complete audit program for an engagement generally should be developed a. Prior to beginning the actual audit work. b. After the auditor has completed an evaluation of the existing internal accounting control. c. After reviewing the client's accounting records and procedures. d. When the audit engagement letter is prepared

Description : Audit programs are modified to suit the circumstances on particular engagements. A complete audit program for an engagement generally should be developed a. Prior to beginning the actual audit work. ... the client's accounting records and procedures. d. When the audit engagement letter is prepared

Last Answer : After the auditor has completed an evaluation of the existing internal accounting contro

Pick out the wrong statement. (A) In a multistep reaction, the slowest step is the rate determining step (B) In general, the rate of a reaction becomes triple for every 10°C rise in temperature (C) Slow chemical reactions have generally high values of activation energy (D) Molecularity of a reaction cannot be zero but the order of a reaction can be zero

Description : Pick out the wrong statement. (A) In a multistep reaction, the slowest step is the rate determining step (B) In general, the rate of a reaction becomes triple for every 10°C rise in temperature (C ... energy (D) Molecularity of a reaction cannot be zero but the order of a reaction can be zero

Last Answer : (B) In general, the rate of a reaction becomes triple for every 10°C rise in temperature

An improved variety of transgenic basmati rice (a) does not require chemical fertilizers and growth hormones (b) gives high yield and is rich in vitamin A (c) is completely resistant to all insect pests and diseases of paddy (d) gives high yield but has no characteristic aroma.

Description : An improved variety of transgenic basmati rice (a) does not require chemical fertilizers and growth hormones (b) gives high yield and is rich in vitamin A (c) is completely resistant to all insect pests and diseases of paddy (d) gives high yield but has no characteristic aroma.

Last Answer : (b) gives high yield and is rich in vitamin A

The reaction that give good yield of n-Hexane is :-

Description : The reaction that give good yield of n-Hexane is :-

Last Answer : The reaction that give good yield of n-Hexane is :- A. `undersetoverset(Na//"dry ether")(rarr)(CH_(3)CH_(2 ... 2)CH_(2)CH_(2)CH_(2)Cl` D. All of them

3, 3-Dimethyl-2-butanol no reaction with HCl yield mainly

Description : 3, 3-Dimethyl-2-butanol no reaction with HCl yield mainly

Last Answer : 3, 3-Dimethyl-2-butanol no reaction with HCl yield mainly A. 2-Chloro-2, 3-dimethyl butane B. ... -3, 3-dimethylbutane D. 1-Chloro-3, 3-dimethylbutane

What is the theoretical yield of a reaction Apex?

Description : What is the theoretical yield of a reaction Apex?

Last Answer : The amount of product obtained/ amount possible X 100

The energy yield from complete oxidation of products generated by second reaction cycle of β-oxidation of palmitoyl CoA will be (A) 5 ATP (B) 12 ATP (C) 17 ATP (D) 34 ATP

Description : The energy yield from complete oxidation of products generated by second reaction cycle of β-oxidation of palmitoyl CoA will be (A) 5 ATP (B) 12 ATP (C) 17 ATP (D) 34 ATP

Last Answer : Answer : D

Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate (C) Biuret (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)

Description : Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total ... (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)

Last Answer : (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate

Dehydration of ammonium carbamate to yield urea is a/an __________ reaction. (A) Exothermic (B) Endothermic (C) Autocatalytic (D) Catalytic

Description : Dehydration of ammonium carbamate to yield urea is a/an __________ reaction. (A) Exothermic (B) Endothermic (C) Autocatalytic (D) Catalytic

Last Answer : (B) Endothermic

During manufacture of H2SO4 , the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the (A) Temperature is increased (B) Pressure is reduced (C) Temperature is increased and pressure is reduced (D) Temperature is reduced and pressure is increased

Description : During manufacture of H2SO4 , the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the (A) Temperature is increased (B) Pressure is reduced (C) Temperature is increased and pressure is reduced (D) Temperature is reduced and pressure is increased

Last Answer : (D) Temperature is reduced and pressure is increased

When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield. (A) Is greater than (B) Is smaller than (C) Equals (D) Can be either greater or smaller than (depends on the type of reaction)

Description : When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield. (A) Is greater than (B) Is smaller than (C) Equals (D) Can be either greater or smaller than (depends on the type of reaction)

Last Answer : (C) Equals

A first order reaction requires two unequal sized CSTR. Which of thefollowing gives higher yield?(A) Large reactor followed by smaller one(B) Smaller reactor followed by larger one(C) Either of the arrangement (A) or (B) will give the same yield(D) Data insufficient, can't be predicted

Description : A first order reaction requires two unequal sized CSTR. Which of thefollowing gives higher yield? (A) Large reactor followed by smaller one (B) Smaller reactor followed by larger one (C) Either of the arrangement (A) or (B) will give the same yield (D) Data insufficient, can't be predicted

Last Answer : (C) Either of the arrangement (A) or (B) will give the same yield

For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a (A) Batch reactor is preferred over a single CSTR for high yield (B) Tubular reactor is preferred over a single CSTR for high yield (C) Both (A) and (B) (D) Single CSTR is the most suitable

Description : For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a (A) Batch reactor is preferred over a ... a single CSTR for high yield (C) Both (A) and (B) (D) Single CSTR is the most suitable

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

In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2 , the yield of B increases with the (A) Increase of temperature (B) Decrease of temperature (C) Increase in initial concentration of A (D) Decrease in initial concentration of A

Description : In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2 , the yield of B increases with the (A) Increase of temperature (B) Decrease of temperature (C) Increase in initial concentration of A (D) Decrease in initial concentration of A

Last Answer : (A) Increase of temperature

For series reaction, the relative yield (A) Is always greater for plug-flow reactor than for the single CSTR of the same volume (B) Statement in (A) is wrong (C) Decreases with increasing conversion (D) Both (A) and (C) hold good

Description : For series reaction, the relative yield (A) Is always greater for plug-flow reactor than for the single CSTR of the same volume (B) Statement in (A) is wrong (C) Decreases with increasing conversion (D) Both (A) and (C) hold good

Last Answer : (D) Both (A) and (C) hold good

Which reaction does not yield an ester as one of the products?(a) A carboxylic acid is heated with an alcohol (b) A Grignard reagent is added to a carboxylic acid (c) An acid halide is treated with an alcohol (d) An alkyl halide is heated with the salt of a carboxylic acid

Description : Which reaction does not yield an ester as one of the products? (a) A carboxylic acid is heated with an alcohol (b) A Grignard reagent is added to a carboxylic acid (c) An acid halide is treated with an alcohol (d) An alkyl halide is heated with the salt of a carboxylic acid

Last Answer : A Grignard reagent is added to a carboxylic acid

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)

Description : 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)

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

Metamorphism changes rocks – (1) structure (2) texture (3) both (1) and (2) (4) actual chemical composition

Description : Metamorphism changes rocks – (1) structure (2) texture (3) both (1) and (2) (4) actual chemical composition

Last Answer : (3) both (1) and (2) Explanation: Namcha Barwa, a mountain in the Tibetan Himalaya, is the eastern anchor of the entire Himalayan mountain chain. It is the highest peak of its own ... as the river enters its notable gorge across the Himalaya, emerging as the Dihang and becoming the Brahmaputra.

Metamorphism changes rocks’ (1) structure (2) texture (3) both (1) and (2) (4) actual chemical composition

Description : Metamorphism changes rocks’ (1) structure (2) texture (3) both (1) and (2) (4) actual chemical composition

Last Answer :  both (1) and (2)

The sun is visible a little before the actual sunrise because of which reaction?

Description : The sun is visible a little before the actual sunrise because of which reaction?

Last Answer : Atmospheric refraction

Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) (A) tan hT/T (B) tan T/T(C) tan hT/tan T(D) None of these

Description : Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) (A) tan hT/T (B) tan T/T (C) tan hT/tan T (D) None of these

Last Answer : (A) tan hT/T