What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on? (A) Litre/mole.second (B) Moles/litre.second (C) Litre/mole (D) Litre/second

What is the unit of the rate constant in a chemical reaction in which
10% of the reactant decomposes in one hour, 20% in two hours, 30% in
three hours and so on?
(A) Litre/mole.second
(B) Moles/litre.second
(C) Litre/mole
(D) Litre/second
by

1 Answer

Answer :

(A) Litre/mole.second
by

Related questions

Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is afunction of reaction temperature. In a chemical reaction, the time requiredto reduce the concentration of reactant from 100 gm moles/litre to 50 gmmoles/litre is same as that required to reduce it from 2 gm moles/litre to 1gm mole/litre in the same volume. Then the order of this reaction is:(A) 0(B) 1(C) 2(D) 3

Description : Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is afunction of reaction temperature. In a chemical reaction, the time required to ... Then the order of this reaction is: (A) 0 (B) 1 (C) 2 (D) 3

Last Answer : (B) 1

In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that requiredto reduce it from 10 moles/litre to 5 moles/litre in the same volume.(A) More than(B) Less than(C) Same as(D) Data insufficient; can't be predicted

Description : In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that requiredto reduce it from 10 moles/litre to 5 moles/litre in the ... (A) More than (B) Less than (C) Same as (D) Data insufficient; can't be predicted

Last Answer : (C) Same as

For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium? (A) 0.253 (B) 0.338 (C) 0.152 (D) 0.637

Description : For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium? (A) 0.253 (B) 0.338 (C) 0.152 (D) 0.637

Last Answer : (B) 0.338

Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then 't' for a first order reaction is given by (A) k. t = ln a/(a - x) (B) k. t = x/a (a - x) (C) k. t = ln (a - x)/a (D) k. t = ln a (a - x)/x

Description : Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then 't' for a first order reaction is given by (A) k. t = ln a/(a - x) (B) k. t = x/a (a - x) (C) k. t = ln (a - x)/a (D) k. t = ln a (a - x)/x

Last Answer : (A) k. t = ln a/(a - x)

The conversion in a mixed reactor/accomplishing a reaction A → 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second. (A) 0.5 (B) 1 (C) 2(D) 3

Description : The conversion in a mixed reactor/accomplishing a reaction A → 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second. (A) 0.5 (B) 1 (C) 2 (D) 3

Last Answer : (A) 0.5

A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds. (A) 1 (B) 3 (C) 1/3 (D) 32

Description : A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds. (A) 1 (B) 3 (C) 1/3 (D) 32

Last Answer : (B) 3

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Description : Which of the following is not a unit of reaction rate? (A) Moles for med/(surface of catalyst) (time) (B) Moles formed/volume of reactor) (time) (C) Mole formed/volume of catalyst) (time) (D) None of these

Last Answer : (D) None of these

When my income was $100,000, I paid $10,000 in taxes. When my income became $200,000, I paid $40,000 in taxes. My marginal tax rate is: a. 10% b. 20% c. 30% d. 40%

Description : When my income was $100,000, I paid $10,000 in taxes. When my income became $200,000, I paid $40,000 in taxes. My marginal tax rate is: a. 10% b. 20% c. 30% d. 40%

Last Answer : c. 30%

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Description : When my income was $100,000, I paid $10,000 in taxes. When my income became $200,000, I paid $40,000 in taxes. My marginal tax rate is: a. 10% b. 20% c. 30% d. 40%

Last Answer : c. 30%

A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is (A) d(VCA )/dt = -F (CAF - CA ) - kCA 2V (B) d(VCA )/dt = F (CAF - CA ) - kCA 2V (C) d(VCA )/dt = -FCA - kCA 2V (D) d(VCA )/dt = FCAF - kCA 2V

Description : A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume ... 2V (C) d(VCA )/dt = -FCA - kCA 2V (D) d(VCA )/dt = FCAF - kCA 2V

Last Answer : (D) d(VCA )/dt = FCAF - kCA 2V

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

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Last Answer : (B) Conversion

A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m￾xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture? (A) The mixture exhibits an azeotrope at 101.3 kPa (B) The composition of the mixture, in percent by volume is: o-xylene 30, p￾xylene 60. and m-xylene 10 (C) The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10 (D) The mixture contain optical isomers

Description : A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m￾xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture? (A) The mixture exhibits ... : o-xylene 30, p-xylene 60 and m-xyoene 10 (D) The mixture contain optical isomers

Last Answer : (A) The mixture exhibits an azeotrope at 101.3 kPa

For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr? (A) 0.4 (B) 0.1 (C) 0.2 (D) None of these

Description : For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr? (A) 0.4 (B) 0.1 (C) 0.2 (D) None of these

Last Answer : (A) 0.4

The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be (A) y (B) 0.95 y (C) 1.05 y (D) 1.8 y

Description : The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be (A) y (B) 0.95 y (C) 1.05 y (D) 1.8 y

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Identify the INCORRECT statement below regarding chemical equilibrium. A All chemical reactions are, in principle, reversible. B Equilibrium is achieved when the forward reaction rate equals the reverse reaction rate. C Equilibrium is achieved when the concentrations of species become constant. D Equilibrium is achieved when the reaction quotient, Q, equals the equilibrium constant. E Equilibrium is achieved when reactant and product concentrations are equal.

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IN a DNA molecule, the guanosine content is 40%, the adenine content will be (A) 10% (B) 20% (C) 30% (D) 40%

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Last Answer : Answer : A

In a DNA molecule the thymine concentration is 30%, the guanosine concentration will be (A) 10% (B) 20% (C) 30% (D) 40%

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Proteins have the SDA: (A) 5% (B) 10% (C) 20% (D) 30%

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Last Answer : Answer : D

Maximum loan size to a single person cannot exceed ________ of total capital funds. A. 30% B. 20% C. 11% D. 10% E. None of the Above

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In the European standard, the aurial transmitter maximum radiated power is ______ of peak visual transmitter power. A. 10% B. 30% C. 20% D. 40%

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Last Answer : C. 20%

The top atmosphere of the Earth directly reflects back into space nearly what part of the total amount of sun’s energy coming to it? A. 10% B. 20% C. 30% (Answer) D. 50%

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Last Answer : C. 30% (Answer)

For preparing ordinary concrete, the quantity of water used, is (A) 5% by weight of aggregates plus 20% of weight of cement (B) 10% by weight of aggregates plus 10% of weight of cement (C) 5% by weight of aggregates plus 30% of weight of cement (D) 30% by weight of aggregates plus 10% of weight of cement

Description : For preparing ordinary concrete, the quantity of water used, is (A) 5% by weight of aggregates plus 20% of weight of cement (B) 10% by weight of aggregates plus 10% of weight of cement (C) ... aggregates plus 30% of weight of cement (D) 30% by weight of aggregates plus 10% of weight of cement

Last Answer : Answer: Option C

The percentage of water for normal consistency, is (A) 5% to 15% (B) 10% to 25% (C) 15% to 25% (D) 20% to 30%

Description : The percentage of water for normal consistency, is (A) 5% to 15% (B) 10% to 25% (C) 15% to 25% (D) 20% to 30%

Last Answer : Answer: Option C

Use of improved implements has potential to reduce the cost of cultivation up to a)10% b) 30% c) 20% d) 15%

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Last Answer : 20%

Use of improved implements has potential to increase productivity up to a)10% b) 30% c) 20% d) 15%

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Exhaust gas energy recovery in Electro turbo compounding (ETC) up to a. 10% Possible b. 20% Possible c. 30% Possible d. 40% Possible

Description : Exhaust gas energy recovery in Electro turbo compounding (ETC) up to a. 10% Possible b. 20% Possible c. 30% Possible d. 40% Possible

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A merchant dealer gives successive discounts of 10% and 20% in that order and makes a profit of 20%. what will be the profit if he offers a single flat discount of 30%? a) 20% b) 16.67% c) 18% d) 14% e) None of these

Description : A merchant dealer gives successive discounts of 10% and 20% in that order and makes a profit of 20%. what will be the profit if he offers a single flat discount of 30%? a) 20% b) 16.67% c) 18% d) 14% e) None of these

Last Answer : let marked price be 100. SP with 10%, 20% = 80% of (90% of 100) = 72. profit = 20% so CP = 72/1.20 = Rs. 60 by offering a flat discount of 30%, sales price = 70% of 100 = 70 profit = (70 - 60) ×100 / 60 = 16.67% Answer: b)

Which of the following series of discounts is the best for a customer? (A) Successive discounts of 10% ,20%,30% (B) Successive discounts of 20%,20%,20% (C) Successive discounts of 15%,15%,15%,15% (D) Successive discounts of 20%,40% a) A b) B c) C d) D e) A and B

Description : Which of the following series of discounts is the best for a customer? (A) Successive discounts of 10% ,20%,30% (B) Successive discounts of 20%,20%,20% (C) Successive discounts of 15%,15%,15%,15% (D) Successive discounts of 20%,40% a) A b) B c) C d) D e) A and B

Last Answer : consider the price as 100 A = 100 × 0.9 × 0.8 × 0.7 =50.4 B = 100 × 0.8 × 0.8 × 0.8=51.2 C = 100 × 0.85 × 0.85 × 0.85 ×0.85 ~ =52.2 D = 100 × 0.8 × 0.6 =48 We see that the maximum discount of 52% (100-48) is on D, which is the best for a customer. Answer : d

Which of the following series of discounts is the best for a customer? (A) Successive discounts of 10% ,20%,30% (B) Successive discounts of 20%,20%,20% (C) Successive discounts of 15%,15%,15%,15% (D) Successive discounts of 20%,40% a) A b) B c) C d) D e) A and B

Description : Which of the following series of discounts is the best for a customer? (A) Successive discounts of 10% ,20%,30% (B) Successive discounts of 20%,20%,20% (C) Successive discounts of 15%,15%,15%,15% (D) Successive discounts of 20%,40% a) A b) B c) C d) D e) A and B

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By what percentage should V2 be greater than VMCA? a. 30% b. 10% c. 20% d. 15%

Description : By what percentage should V2 be greater than VMCA? a. 30% b. 10% c. 20% d. 15%

Last Answer : b. 10%

By what percentage should V2 be greater than VMCA? a. 30% b. 10% c. 20% d. 15%

Description : By what percentage should V2 be greater than VMCA? a. 30% b. 10% c. 20% d. 15%

Last Answer : b. 10%

If a double stranded DNA has 20% Thymine, the percentage of Guanine in the DNA a) 30% b) 10% c) 90% d) 40%

Description : If a double stranded DNA has 20% Thymine, the percentage of Guanine in the DNA a) 30% b) 10% c) 90% d) 40%

Last Answer : a) 30%

Bronze is an alloy of copper, zinc , and tin having composition (A) 60% - 30% - 10% (B) 70% - 20% - 10% (C) 88% - 2% - 10% (D) 50% -30% - 20%

Description : Bronze is an alloy of copper, zinc , and tin having composition (A) 60% - 30% - 10% (B) 70% - 20% - 10% (C) 88% - 2% - 10% (D) 50% -30% - 20%

Last Answer : (C) 88% - 2% - 10%

The speed of a d.c. shunt motor at no-load is (A) 5 to 10% (B) 15 to 20% (C) 25 to 30% (D) 35 to 40% higher than its speed at rated load.

Description : The speed of a d.c. shunt motor at no-load is (A) 5 to 10% (B) 15 to 20% (C) 25 to 30% (D) 35 to 40% higher than its speed at rated load.

Last Answer : (A) 5 to 10%

For a __________ order chemical reaction as shown in the bellow figure, the fractional conversion of reactant 'A' is proportional to time. (A) Zero (B) First (C) Second (D) Third

Description : For a __________ order chemical reaction as shown in the bellow figure, the fractional conversion of reactant 'A' is proportional to time. (A) Zero (B) First (C) Second (D) Third

Last Answer : (A) Zero

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Last Answer : (B) First

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Last Answer : (B) Temperature

In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant) (A) CA (B) CA 2 (C) CA 3 (D) CA

Description : In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases ... where, CA = concentration of the reactant) (A) CA (B) CA 2 (C) CA 3 (D) CA

Last Answer : (B) CA 2

Which of the following is not a unit of mass transfer co-efficient? (A) Moles transferred/ [(time) (area) (mole fraction)] (B) Moles transferred/ [(time) (area) (mass A/mass B)] (C) Moles transferred/ [(time) (area) (pressure)] (D) None of these

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Decomposition rate of a liquid 'X' which decomposes as per the reaction as shown in the bellow figure is given by: (A) K1 . CX (B) (K1 + K2 + K3 ) CX (C) (K1 + K2 ) CX (D) (K2 + K3 ) CX

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Last Answer : (C) (K1 + K2 ) CX

The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called (A) Operational yield (B) Relative yield (C) Selectivity (D) None of these

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Two candles of same height are lighted at the same time. The first is consumed in 6 hours and second in 4 hours. Assuming that each candles burns at a constant rate, in how many hours after being lighted, the ratio between the first and second candles becomes 2:1? a) 1 hour b) 2 hour c) 3 hour d) 4 hour e) None of these

Description : Two candles of same height are lighted at the same time. The first is consumed in 6 hours and second in 4 hours. Assuming that each candles burns at a constant rate, in how many hours after being lighted, the ratio between ... becomes 2:1? a) 1 hour b) 2 hour c) 3 hour d) 4 hour e) None of these

Last Answer : Answer: C Let height of both candles is ‘h’ and let after t times ratio between the height be 2:1 h – t*h/6 : h – t*h/4 = 2:1 t = 3

Two candles of same height are lighted at the same time. The first is consumed in 3 hours and second in 2 hours. Assuming that each candles burns at a constant rate, in how many hours after being lighted, the ratio between the first and second candles becomes 2:1? A) 2 hour B) 2.5 hour C) 4 hour D) 1.5 hour E) None of these

Description : Two candles of same height are lighted at the same time. The first is consumed in 3 hours and second in 2 hours. Assuming that each candles burns at a constant rate, in how many hours after being lighted, the ratio between the ... 2:1? A) 2 hour B) 2.5 hour C) 4 hour D) 1.5 hour E) None of these

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For the irreversible reaction, Ca+ 2C = Ca C2, Δ H°298 = - 60000 J . mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be (A) 30,000 J (B) 60,000 J (C) 90,000 J (D) 2,40,000 J

Description : For the irreversible reaction, Ca+ 2C = Ca C2, Δ H°298 = - 60000 J . mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved ... will be (A) 30,000 J (B) 60,000 J (C) 90,000 J (D) 2,40,000 J

Last Answer : (C) 90,000 J

Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Description : Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Last Answer : (4) All of these are correct Explanation: In chemistry, the study of rates and mechanisms of chemical processes and, of the factors on which they depend, is called kinetics. is the study of ... provides a very detailed picture of which bonds are broken and formed during the course of a reaction.

Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Description : Kinetics is the study of: (1) The rate of chemical reaction (2) How fast the reactions go (3) The mechanisms and paths of the molecules take in joining from one reactant to products (4) All of these are correct

Last Answer : All of these are correct

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is (A) 3.06 × 10 5 (B) 6.12 × 10 5 (C) 7.24 × 10 5 (D) 9.08 × 10

Description : It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of ... 3.06 10 5 (B) 6.12 10 5 (C) 7.24 10 5 (D) 9.08 10

Last Answer : (A) 3.06 × 10

In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants) (A) Addition of inert gas favours the forward reaction, when Δx is positive (B) Pressure has no effect on equilibrium, when Δn = 0 (C) Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve) or zero) (D) All 'a', 'b' & 'c'

Description : In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants) (A) Addition of inert gas favours the forward reaction, when Δx is positive (B) Pressure has no effect on equilibrium, when Δn = ... any value of Δx (+ ve, - ve) or zero) (D) All 'a', 'b' & 'c'

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

6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant? (A) 100% (B) 95% (C) 75% (D) 20%

Description : 6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant? (A) 100% (B) 95% (C) 75% (D) 20%

Last Answer : (B) 95%

An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is (A) 0.80 (B) 1.33 (C) 1.60 (D) 2.67

Description : An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The ... (in hours) for 40% conversion of P is (A) 0.80 (B) 1.33 (C) 1.60 (D) 2.67

Last Answer : (C) 1.60